Fanfics that are crossovers between works across one or more types of media.
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L
- Ladybird (My Little Pony: Friendship Is Magic, Worm)
- Ladybug in a Half Shell (Miraculous Ladybug,Teenage Mutant Ninja Turtles (2012))
- Ladybug is Team Cap (Miraculous Ladybug, Marvel Cinematic Universe)
- Ladybug: A Young Avenger (Marvel Cinematic Universe, Miraculous Ladybug)
- The Lady of the Flies (High School D×D, Worm)
- A Lamb In Hell (Hellaverse, Cult of the Lamb)
- Lancer: Masters of the Citadel (Lancer, Mass Effect)
- Land of No Color (Pokémon, Digimon)
- Land Of Steel (Nasuverse, Worm)
- Lantern Prime (Transformers, Green Lantern)
- Larry Boy and the Little Man of Purpleness (Star Wars, VeggieTales)
- Last Child of Krypton (Superman, Neon Genesis Evangelion)
- The Last Connor (Alien, Terminator)
- The Last Daughter (Superman, Worm)
- The Girl of Tomorrow: Rewrite.
- The Last Lion of House Reyne (Harry Potter, A Song of Ice and Fire)
- Last Mage of Krypton (Harry Potter, Superman)
- The Last Son (Superman/DC Comics, X-Men: Evolution/Marvel)
- The Last Spartan (Halo, Mass Effect)
- The Last of Us Series (Once Upon a Time (2011), The Last of Us)
- Leaf (The Cosmere, The Stormlight Archive, Worm)
- A League Beyond Legends (Powerpuff Girls Doujinshi, Grim Tales from Down Below)
- Leap of Faith (Catch Me, If You Can) (MCU Spider-Man Series, Batman)
- Learning from the best (whether you want to or not) (The Incredibles, Miraculous Ladybug)
- Legacy of the Enginseers (Worm, Warhammer 40,000)
- Legacy of the Red Sun (Star Wars, Superman)
- Legacy (Sekiro/Kimetsu no Yaiba) (Sekiro: Shadows Die Twice, Demon Slayer: Kimetsu no Yaiba)
- Legendary Adventurers, Futuristic Saviors (Princess Mononoke, Inuyasha, Nausicaä of the Valley of the Wind, Howl's Moving Castle, Earthsea, Castle in the Sky, Godzilla, The Incredible Hulk and even FernGully: The Last Rainforest)
- Legendary Spider-Man (The Legend of Korra, Spider-Man)
- Legendary Spider-Girl (The Legend of Korra, Spider-Man)
- The Legend of Eevee (The Legend of Zelda, Pokémon)
- The Legend of Gobber the Belch (Brave, How to Train Your Dragon)
- The Legend of Miraculous (The Legend of Zelda, Miraculous Ladybug)
- The Legend of Ruby (RWBY, Avatar: The Last Airbender/The Legend of Korra)
- Legend of the Spider-Man (The Legend of Korra, Spider-Man)
- The Legendary Spider-Man (Spider-Man, Marvel Universe)
- Legend of the Spider-Man: Reign (The Legend of Korra, Spider-Man: Reign)
- Lelouch of the Wings of Rebellion (Code Geass, Persona 5)
- Let Nothing Fall to Chance (Fallout: New Vegas and Arknights)
- Lethal Species (Buffy the Vampire Slayer, Alien)
- Lethal Job (crossover with Spider-Man and Inside Job (2021))
- LIBERI FATALIS: The Therianthrope Chronicles (Albedo: Erma Felna EDF, Katmandu and Ace Combat)
- Lie and Seek (Code Geass, Fire Emblem: Three Houses)
- The Life Is A Game Multiverse (Harry Potter, Marvel vs. Capcom, Mass Effect, Naruto, and many more)
- Life Ore Death (Young Justice (2010), Mistborn: The Original Trilogy)
- Life's a Pay to Win Game (Trapped in a Dating Sim: The World of Otome Games is Tough for Mobs, The Eminence in Shadow)
- The Light of Abyss (The Owl House, Marvel Universe)
- Light and Dark (Danny Phantom, Young Justice (2010))
- Light at the End (Metro: Last Light, RWBY)
- Lighting Candles (Big Hero 6, Rise of the Guardians)
- The Lightning Strike (Marvel Cinematic Universe, Harry Potter)
- Light of the Emperor (Warhammer 40,000, The Owl House)
- Light Rage: Rebellion (The Owl House, inFAMOUS: Second Son)
- Light's Song (The Owl House, Supernatural)
- Like Dreamers Do (Wreck-It Ralph, TRON, Disney Animated Canon)
- Lincoln Loud: The Savviest Spider-Man (The Loud House, Spider-Man)
- The Lion, The Witch, and The Fairy's Tail (Fairy Tail, The Chronicles of Narnia)
- Liquid Sample ([PROTOTYPE], The Familiar of Zero)
- Listen, And Look Up (The Owl House, Superman (2025))
- Little Black Death Note (Harry Potter, Death Note)
- The Little Foreigner (Worm, Fate/Grand Order)
- The Little Hitchhiker (The Haunted Mansion, Disney Theme Parks, The Little Mermaid, Song of the South, Hercules, Monsters, Inc.)
- A Little Overshadowing Never Hurt Anyone (Danny Phantom, Young Justice (2010))
- The Little Pony Legend (My Little Pony: Friendship Is Magic, The Legend of Korra with some elements from the Disney Animated Canon as well.)
- LMS (BIONICLE, LEGO Space, Rock Raiders)
- The Little Stark (The Little Mermaid, Iron Man Films)
- Logic & Trickster (Ace Attorney, Persona 5)
- The Lonely Dragacorn (Wreck-It Ralph, Skylanders)
- The Long Road (Rise of the Guardians, How to Train Your Dragon)
- The Longest Hunt (Bloodborne, RWBY)
- Long Live the Car Crash Hearts. (Massive Multiplayer Crossover🔀)
- Longest Novel: Fall of the Republic (Digimon, Wayside, The Amazing World of Gumball, Gravity Falls, Craig of the Creek, Super Robot Monkey Team Hyperforce Go!, The Loud House, Harvey Street Kids, My Life as a Teenage Robot)
- Look To The Stars (Star Wars Legends, A Song of Ice and Fire)
- The Looney Scientists Show (Kim Possible, King Arthur's Disasters, Phineas and Ferb, Recess)
- Lord of the Castle (Castlevania (2017), Justice League)
- Lore Khepri (Worm, Lore Olympus)
- lost beneath the turning wheel (Star Wars, Assassin's Creed)
- The Lost and the Damned (Fallout 3, Warhammer 40,000)
- The Lost Child Of Azarath (Teen Titans, Doctor Who)
- Lost in Camelot series (Lost Girl, Merlin)
- lost in the infinite lights (Yu-Gi-Oh!, My Hero Academia)
- A Lost Hero's Fairytale (Ben 10, Fairy Tail)
- Lost in the Woods & sequel (Star Trek: The Next Generation, Firefly)
- A Lost Owl (The Owl House, Amphibia)
- A Lost Pyromaniac (Worm, DC Universe Online)
- Lost to Dust (RWBY, Fate/Grand Order)
- A Lost Witch (The Owl House, Warhammer 40,000)
- A Loud Among Demons (The Loud House Helluva Boss)
- Loud Ed Drama (Total Drama with Ed, Edd n Eddy and The Loud House)
- The Loud House: Revamped (The Loud House, Massive Multiplayer Crossover)
- Loud Techs (The Loud House, Glitch Techs)
- Louds vs. the Forces of Evil (The Loud House, Star vs. the Forces of Evil)
- Love at First Sight (Once Upon a Time) (Once Upon a Time (2011), Mr. Right)
- A Love to Start a War (Class of '09, Infinite Stratos)
- Lovehammer (Sailor Moon, Warhammer 40,000)
- Lovehammer Inc (Sailor Moon, Warhammer 40,000)
- LOVE HINA DOUBLE TROUBLE (Love Hina, Kamen Rider, School Days, Higurashi: When They Cry)
- Love Is All You Need to Destroy Your Enemies (The Dresden Files, Welcome to Night Vale)
- Loves Heartstrings (Hannah Montana, Kung Fu Panda)
- Love Opens Many Doors (Ranma ½, Planescape, Dungeons & Dragons 4th Edition)
- Love's Sacrifices (Carmilla the Series, Pitch Perfect, Ginger Snaps, The Vampire Diaries)
- L.O.V.E vs. H.A.T.E (Massive Multiplayer Crossover)
- Love Worth Waiting For (Frozen, Mulan)
- Lulu's Bizarre Rebellion (Code Geass, JoJo's Bizarre Adventure)
- Lumos: when the darkness finally meets the light
- Luz's Bizarre Adventure (The Owl House, JoJo's Bizarre Adventure)
- Luz's Guardian Angel (The Owl House, Hazbin Hotel)
- Luz's Playtime (The Owl House, Poppy Playtime)
- Luz Noceda, the Jedi Witch (The Owl House, Star Wars)
- Lyoko Techs (Code Lyoko, Glitch Techs)
- Lyrics of Sorrow (Castlevania, Lyrical Nanoha)
M
- Mac Hires the Inception Gang (Inception, It's Always Sunny in Philadelphia)
- Machine Ghosts (Danny Phantom, SD Gundam Force)
- Madam Malfoy, ili Brak po prinuzhdeniyu (Harry Potter, Don Quixote)
- Madhouse (Trexmaster) (Pokémon, Team Fortress 2)
- Mad World (Invader Zim/Johnny the Homicidal Maniac)
- Magicae Est Potestas (Artemis Fowl, Undertale)
- Magical Girl Convergence (Buddy Complex, Day Break Illusion, Izetta: The Last Witch, Lyrical Nanoha, Puella Magi Madoka Magica, Sailor Moon (Sailor Moon R/Black Moon Arc), Strike Witches, Vividred Operation, Yuki Yuna is a Hero)
- Magical Girls Unite Retransformed (Puella Magi Madoka Magica and almost every other Magical Girl story in existence)
- Magical Girl Lyrical Nanoha: AvengerS (Lyrical Nanoha, Marvel Cinematic Universe)
- Magical Girl Lyrical Taylor (Worm), (Magical Girl Lyrical Nanoha)
- Magical Pony Lyrical Twilight (Lyrical Nanoha, My Little Pony: Friendship Is Magic)
- Magical Troubleshooting Crossover Fighting Federation Ultra (Ranma ½, Slayers, Street Fighter, Final Fantasy VII, The King of Fighters, Neon Genesis Evangelion, Tenchi Muyo!, others)
- Magic and Mayhem (Casper, Hocus Pocus)
- Magic and Steel (The Transformers, Sleeping Beauty (1959), elements of other Disney Animated Canon works)
- Magic Kingdoms (Disney Animated Canon,Snow White and the Seven Dwarfs, Aladdin (Disney))
- The Magic of Torchwood (Torchwood, Doctor Who, Harry Potter)
- Mahou Shoujo Keiongakubu Magica (K-On!, Puella Magi Madoka Magica)
- Manehattan's Lone Guardian (Mega Man Zero, My Little Pony: Friendship Is Magic)
- A Man Like Him...Is A Teacher?! (John Wick, Blue Archive)
- A Man Like No Other (The Hunger Games, The Avengers (2012), The 100)
- A Man of Focus (John Wick, Black Lagoon)
- A Man of Iron (Game of Thrones/A Song of Ice and Fire, Marvel Universe)
- Man off the Moon (Fate/EXTRA, Mass Effect)
- The Man Who Sold the World (Bloodborne-centred Massive Multiplayer Crossover)
- The Man with No Name (Firefly, Doctor Who)
- The Man Out of Time (My Hero Academia, Marvel Universe)
- Mandie's New Target (The Fairly OddParents!, Danny Phantom)
- Manray Omniverse (Massive Multiplayer Crossover)
- The Many Dates of Danny Fenton (Danny Phantom-centric Massive Multiplayer Crossover)
- The Many Worlds Interpretation (The Big Bang Theory, Discworld)
- Maple Sugar Pretty Cure (Futari wa Pretty Cure, Turning Red)
- March of the Inevitable (Warhammer, Dragon Age)
- Mare Genius (Girl Genius, My Little Pony: Friendship Is Magic)
- Marevel Alternate Universe (Marvel Cinematic Universe, My Little Pony: Friendship Is Magic)
- Maribat AU (Batman, Miraculous Ladybug)
- Marinette's Island Adventure (Miraculous Ladybug, Total Drama)
- Mario & Luigi: Plumber Heroes (Super Mario Bros., My Hero Academia)
- Mario and Sonic: Heroes Unite! (Super Mario Bros., Sonic the Hedgehog)
- Marvel Falls (Ms. Marvel, Gravity Falls)
- Marvel Gems Universe (Marvel Comics, Steven Universe)
- The Marvelous World of DC (Marvel Comics, The DCU Vertigo Comics, Image Comics, Dark Horse Comics, and Harry Potter)
- Marvelous Little Ponies Universe (Marvel Cinematic Universe, Spider-Man, My Little Pony: Friendship Is Magic)
- The Masked Toon Singer (Massive Multiplayer Crossover)
- The Masks We Wear (Worm/BIONICLE) (Worm, BIONICLE)
- Mass Effect: Bionicle Revolution (Mass Effect, BIONICLE)
- Mass Effect: Clash of Civilizations (Halo, Mass Effect)
- Mass Effect Co OPA Voyage To The Galaxy (Mass Effect, Voyage)
- Mass Effect: Human Revolution (Deus Ex: Human Revolution, Mass Effect)
- Mass Effect: The Equestrian Equation (Mass Effect, My Little Pony: Friendship Is Magic)
- Mass Foundations
- Redemption in the Stars (Mass Effect, Fallout)
- All the World's a Stage (Doctor Who, Fallout, Soul Series)
- The Master of Death (Harry Potter, The Dresden Files)
- Master Potter of Kamar-Taj (Harry Potter, Doctor Strange (2016))
- The Matrix Rewinds (Life is Strange (2015), The Matrix)
- Max Payne Stumbles Into Equestria (Max Payne, My Little Pony: Friendship Is Magic)
- Max Wolf Revolutions (Pokémon, Avatar, Darkstalkers, others)
- Maybe I'm a Lion (The Garden of Sinners, [PROTOTYPE])
- Megas 00 (Mobile Suit Gundam 00, Megas XLR)
- MEGAS Force (Star Wars, Megas XLR)
- Megas of Mars (Megas XLR, Mobile Suit Gundam: Iron-Blooded Orphans)
- Megami no Hanabira (Shin Megami Tensei, Sono Hanabira ni Kuchizuki Wo (a Yuri Visual Novel series))
- Megamix Tournament (Tournament-styled Massive Multiplayer Crossover)
- Meloetta: Melody of Discord (Pokémon, My Little Pony: Friendship Is Magic, Vocaloid)
- Memories of Iron (Iron Man, Worm)
- Menburen no Tsuinzu (Ratchet & Clank, Kingdom Hearts)
- Mentor Day (The Amazing World of Gumball, Regular Show)
- The Mermaid and the Genie (Aladdin (Disney), The Little Mermaid)
- Metal Gear: Green (My Hero Academia, Metal Gear)
- Metastability (RWBY, Red vs. Blue)
- A Mewtiful Brockton Bay (Worm, Pokémon)
- MIA (Gravitys Rainboom) (Halo, My Little Pony: Friendship Is Magic)
- The Midnightverse: Too Huge to Be True (Chip 'n Dale: Rescue Rangers, TaleSpin), Lost and Found (Chip 'n Dale: Rescue Rangers, The Rescuers, Mrs. Frisby and the Rats of NIMH), Diamonds in the Desert (Chip 'n Dale: Rescue Rangers, Chip 'n Dale)
- A Midsummer Night's Dream (Killbles) (My Little Pony: Friendship Is Magic, Pacific Rim)
- Mighty Morphin Mecha Rangers! (Neon Genesis Evangelion, Tengen Toppa Gurren Lagann, The Big O, Zoids, Vision of Escaflowne, Yu-Gi-Oh!, Transformers, FLCL, Megas XLR, Code Geass, Call of Duty, Read or Die, others)
- A Mile In My Shoes (Fullmetal Alchemist, Bleach)
- Milo Murphy's Law: The Empire Strikes Back (Star Wars, Milo Murphy's Law, Phineas and Ferb, Hamster & Gretel)
- The Minkiad (Boy Meets World, Girl Meets World)
- A Miracle and a Hazbin (Hazbin Hotel, Encanto)
- Miraculous Escalation (Miraculous Ladybug, Worm)
- Miraculous Ladybug vs. the Forces of Evil (Miraculous Ladybug, Star vs. the Forces of Evil)
- Miraculous: Power of the Primes (Transformers, Miraculous Ladybug)
- Miraculous Ninja (Miraculous Ladybug, Randy Cunningham: 9th Grade Ninja)
- Miraculous Wings and Webs (Miraculous Ladybug, Batman, Spider-Man)
- Mirai SMP (SMPLive, Future Diary)
- Mischief (MHA) (My Hero Academia, Marvel Universe)
- The Misery Senshi Neo-Zero Double Blitzkrieg Debacle (Sailor Moon, Daria, Beavis and Butt-Head)
- The Misfits (Walker) (Dragon Ball, Breath of Fire II, Mobile Suit Gundam Wing, EarthBound (1994), Real Life, others)
- The Misfits Series (X-Men: Evolution, G.I. Joe: A Real American Hero)
- Mission Possible (Kim Possible, The Adventures of Jimmy Neutron, Boy Genius)
- The Mission Stays the Same (Mass Effect, Warhammer 40,000)
- Mission to Silas (Ginger Snaps, The Craft, Carmilla the Series, and D.E.B.S.)
- Mitraka (Gor, A Song of Ice and Fire, The Witcher, Star Wars, The Sword of Truth, Dragon Age: Inquisition)
- MLP Xenoverse (My Little Pony: Friendship Is Magic, Dragon Ball Xenoverse)
- Mobile Fighter Evangelion (Neon Genesis Evangelion, Gundam)
- Mobile Suit/Mass Effect: The First Contact War (Gundam, Mass Effect)
- Mobile Suit Gundam Origin Of Salvation (Mobile Suit Gundam: The Origin, gen:LOCK)
- Monkey and Butterfly (One Piece, Star vs. the Forces of Evil)
- The Monkey D. Haru Series (Harry Potter, One Piece)
- Mononofu (Touken Ranbu, Onmyōji (2016))
- Monsters (Aliens, Once Upon a Time (2011))
- The Monster Beneath Her Skin (Worm, Godzilla)
- Monster High's Monstatrix (Monster High, Ben 10)
- Monsters In Paradise (Pokémon, Touhou Project)
- Monsters of My Own (Pokémon, Young Justice (2010))
- Monsters Versus Aliens (Lilo & Stitch, Monsters, Inc.)
- Moonlit Marvel! (Nasuverse, Marvel Universe)
- The Moon's Flash Princess (Sailor Moon, Sword Art Online)
- More than Meets the Eye (Ultimate Marvel, Transformers)
- Morgan Freeman's Blessings on this Beautiful Hood! (The Boondocks, KonoSuba)
- Morphin Fate (Fate/Zero, Power Rangers, Kamen Rider Decade)
- Mortal Draw, Dragon's Breath (Sekiro: Shadows Die Twice, Demon Slayer: Kimetsu no Yaiba)
- Mortal Kombat vs Marvel Universe (Mortal Kombat, Marvel Universe)
- Mortal Kombat vs. The Owl House (Mortal Kombat, The Owl House)
- Morty's On It (Hailey's On It!, Rick and Morty)
- The Mountain and the Wolf (A Song of Ice and Fire/Game of Thrones, Warhammer Fantasy)
- MRA Trilogy (Frozen, Mass Effect, The Land Before Time and many, many more)
- The Multiverse Adventures While Riding On A Bus (Massive Multiplayer Crossover)
- Multiversal Constants (Young Justice (2010), Super Sons)
- Multverse Heroes: Magical Destinies (The Owl House, Amphibia, and Star vs. the Forces of Evil)
- The Multiverser Saga (Young Justice (2010), Neptunia, The League of Extraordinary Gentlemen and others)
- The MUSHU-Verse (Western Animation Massive Multiplayer Crossover)
- Mutants And Heroines (DC Super Hero Girls (2019), Rise of the Teenage Mutant Ninja Turtles)
- Mutant Storm (Harry Potter, X-Men)
- The Mutant Witch (The Owl House, X-Men)
- Muv-Luv: DYRL (Muv-Luv Alternative, Macross Frontier)
- My Academia Climax! (My Hero Academia, Kamen Rider Den-O)
- My Adventures With Superman and Sonic the Hedgehog (My Adventures with Superman, Sonic the Hedgehog (2020))
- My Bloody Academia (Kill la Kill, My Hero Academia)
- My Dark Knight Academia (Batman, My Hero Academia)
- My Devil Academia (Chainsaw Man, My Hero Academia)
- My Driver Academia (My Hero Academia, Xenoblade Chronicles 2)
- My Friendship with a Supersoldier (Halo, My Adventures with Superman)
- My Harem Academia (My Hero Academia, Avatar: The Last Airbender)
- My Hero Academia: Unchained Predator (My Hero Academia, Doom (2016))
- My Hero Playthrough (My Hero Academia, The Gamer, Sailor Moon, others)
- My Hero Prime (My Hero Academia, Transformers)
- My Hero Pokedamia (My Hero Academia, Pokémon)
- My Hero SCP (My Hero Academia, SCP Foundation)
- My Hero School Adventure is All Wrong, As Expected (My Hero Academia, My Youth Romantic Comedy Is Wrong, as I Expected)
- My Heroes Reborn (My Hero Academia, One Piece, Naruto, Fairy Tail, Ranma ½, My Little Pony: Friendship Is Magic, others)
- My Huntsman Academia (RWBY, My Hero Academia)
- My Ideal Academia (Fate/stay night, My Hero Academia)
- My Incredible Academia (My Hero Academia, The Incredibles)
- My Little Animaniacs (My Little Pony: Friendship Is Magic, Animaniacs)
- My Little Castlevania, (My Little Pony: Friendship Is Magic, Castlevania)
- My Little Caboose: Blue is Magic! (My Little Pony: Friendship Is Magic, Red vs. Blue)
- My Little Community Friendship Is Awesome (My Little Pony: Friendship Is Magic, Community)
- My Little Denarians (My Little Pony: Friendship Is Magic, The Dresden Files)
- My Little HetaStuck MSTs (My Little Pony: Friendship Is Magic, Homestuck, Hetalia: Axis Powers, Harry Potter)
- My Little Pirates: Luffy's Adventures in Equestria (My Little Pony: Friendship Is Magic, One Piece)
- My Little Pony: Nakama Is Magic (My Little Pony: Friendship Is Magic, One Piece)
- My Miraculous Academia (My Hero Academia, Miraculous Ladybug)
- My Next Life As A Supervillain: All Routes Lead To Doctor Doom! (Marvel Cinematic Universe, My Next Life as a Villainess: All Routes Lead to Doom!)
- My Prime Academia (Transformers: Prime, My Hero Academia)
- My Princess Academia (Star vs. the Forces of Evil, My Hero Academia)
- My Teen Romantic Comedybecamean Isekai Historical Fantasy (My Youth Romantic Comedy Is Wrong, as I Expected, Romance of the Three Kingdoms)
- The Myth of Link & Zelda: Survivors of the Calamity (The Legend of Zelda, Super Mario Bros.).
- The Myth of Link & Zelda: Breath of the Wild is the first story.
- The Myth of Link & Zelda: Age of Calamity is the second story.
- My Trans-Dimensional Overpowered Protagonist Harem Comedy Is Wrong (Is It Wrong to Try to Pick Up Girls in a Dungeon?, My Youth Romantic Comedy Is Wrong, as I Expected)
- My Wizarding Academia (My Hero Academia, Harry Potter)
- My Venom Academia: Symbiote's Justice (My Hero Academia, Venom (2018))
- My(stara's) Little Ponies: Friendship Is Adventuring (My Little Pony: Friendship Is Magic, Mystara)
- Mythos Effect (Mass Effect, CthulhuTech)
N
- Nack and Psycho (Massive Multiplayer Crossover with Sonic the Hedgehog, Who Framed Roger Rabbit, and others)
- Nami's Grace (One Piece, The Seven Deadly Sins)
- Nanoha Genesis Evangelion (Lyrical Nanoha, Neon Genesis Evangelion)
- Nanosuits And Soul Magic (Crysis, RWBY)
- Narnia and the North (The Chronicles of Narnia, Game of Thrones)
- Naruto Genkyouien (School Days, Naruto)
- Naruto's Waifu Marriage! (Naruto, High School D×D, Bleach, SPY×FAMILY, Fairy Tail, Akame ga Kill!, My Hero Academia, Teen Titans (2003))
- Naruto the Shinobi Shaman of Konoha (Naruto, Shaman King)
- National Anthem (Fusion Fic/conceptual crossover between Super Smash Bros. and The Hunger Games)
- Necessary to Win (Girls und Panzer, Saki)
- The Necromancer (The Lord of the Rings Film Trilogy, Once Upon a Time (2011))
- A Necromancer's Wild Card (Persona 3, Is This A Zombie?)
- A Needed Hero (My Hero Academia, Akame ga Kill!)
- Neither a Bird nor a Plane, it's Deku! (My Hero Academia, DC Comics)
- Neon Genesis EvangeléMon (Neon Genesis Evangelion, Pokémon)
- Neon Exodus Evangelion (Neon Genesis Evangelion, Tomb Raider, The X-Files)
- Neon Genesis Evangelion: Senshi no Michi (Street Fighter, Neon Genesis Evangelion)
- Neon Genesis Madoka Magica (Neon Genesis Evangelion, Puella Magi Madoka Magica, potential Massive Multiplayer Crossover.)
- Never Tickle A Sleeping Dragon (Harry Potter, House of the Dragon)
- The New Age of Monsters (Godzilla, Pacific Rim, Neon Genesis Evangelion, Symphogear)
- New Game, New life (Ranma ½, The Gamer, Sailor Moon, Campione!, Inuyasha, Kenichi: The Mightiest Disciple, Variable Geo, Ah My Buddha!!, Demon Slayer: Kimetsu no Yaiba)
- The New Jedi Order: A Vision of Confluence (Star Wars Legends, Warhammer 40,000)
- A new kind of Fairy Queen (Fairy Tail, The Dresden Files)
- The New Lives Saga (Sailor Moon, Pokémon, Zatch Bell!, One Piece, Ranma ½, Naruto)
- The New Recruit (Chronicle, The Avengers (2012))
- New Stars (Star Wars: The Clone Wars and The Orville)
- The New Teacher (Spider-Man, X-Men)
- New Vegas Showtime (Fallout: New Vegas and Persona 5)
- A New World, A New Way (Pokémon, My Little Pony: Friendship Is Magic)
- New World Blues (Fallout: New Vegas, RWBY)
- The Newest Challenger (Naruto, Street Fighter)
- Next Grand World (Fate/Grand Order, Kamen Rider Zi-O)
- Nexus (Transformers: Prime, Devil May Cry)
- The Night Unfurls (Bloodborne, Kuroinu: Kedakaki Seijo wa Hakudaku ni Somaru)
- Nights End, Days Begun (Worm, My Hero Academia)
- NiGHTS: Quatro Facets of Dreams (NiGHTS into Dreams…, Coraline, Spooky Month, Gravity Falls, and Undertale)
- The Nightmare Before Hogwarts (Harry Potter, The Nightmare Before Christmas)
- Nightmare in Arkham (Batman, A Nightmare on Elm Street )
- A Ninja's Guide to Gotham (Naruto, Batman)
- No one Escapes...Redemption?? (Dead by Daylight, Hazbin Hotel)
- The Nobody of Ever After High (Kingdom Hearts, Ever After High)
- Noah Maxwell Takes A Little Trip Here (RWBY, The Slender Man Mythos)
- Not Just a Champion, a Hero (My Hero Academia, Pokémon)
- Of Noble Intentions (Cyberpunk 2077, Blue Archive)
- Nobody Expects The Shinobi Inquisition (Naruto, Dragon Age)
- No Chance for Fate (Ranma ½, Sailor Moon)
- No Fate, Only Family (The Owl House, Amphibia, She-Ra and the Princesses of Power, and Gravity Falls)
- No Gods, Only Guns (Mass Effect, Borderlands)
- NoHoper (Death Note, The House of Night)
- No Mutant Left Behind (X-Men, Teenage Mutant Ninja Turtles (2012))
- No Need For Destiny (Ranma ½, Sailor Moon, Naruto, Ah! My Goddess, Slayers, Tenchi Muyo!, Yu-Gi-Oh!, Grenadier)
- No Need for Titles (Frozen, How to Train Your Dragon)
- Non Serviam (Worm, High School D×D)
- No Plumbers Allowed (Super Mario Bros., Worm)
- None of Us Are Out Here On Our Own (KPop Demon Hunters, The Owl House)
- Not A Story The Jedi Would Tell You (Star Wars, Star Trek: Lower Decks)
- Not Done Fighting (Spider-Man: Spider-Verse, Marvel Cinematic Universe)
- Nothing is Impossible (Kim Possible, Jackie Chan Adventures, The Powerpuff Girls (1998) and My Life as a Teenage Robot)
- Nothing Is True (Assassin's Creed, The 100)
- Not the intended use (Zantetsuken Reverse) (Castlevania, Shin Megami Tensei)
- Novax (Worm, Supreme Commander)
O
- Oceanus (Worm, One Piece)
- The Odds (Arrowverse, The Hunger Games)
- The Odyssey Resurgence (Stargate SG-1, Independence Day: Resurgence)
- Of Crystal Shards and Dust (RWBY, Final Fantasy XV)
- Of Elder Scrolls and Huntsmen: Dragon Rose (RWBY, The Elder Scrolls)
- Official Fanfiction University (any fandom with one)
- Of Gods and Men (2007) (Death Note, Harry Potter)
- Of Gods and Men (silverbird6) (The Camp Half-Blood Series, Marvel Cinematic Universe)
- Of Heroes and Devils (My Hero Academia, High School D×D)
- Of Lovebugs and Promises (White Collar, Marvel Cinematic Universe)
- Of Quirks and Magic (My Hero Academia, Marvel Comics)
- Of State (How to Train Your Dragon, Frozen)
- Ohana of the Galaxy (Lilo & Stitch: The Series, Guardians of the Galaxy (2014))
- Oh Good Hunter (Worm, Bloodborne)
- Okron Tournament (Tournament-Style Massive Multiplayer Crossover)
- Old Meets New (original continuity Scooby-Doo and new Scooby-Doo! Mystery Incorporated )
- Olivia Goes West (The Great Mouse Detective, An American Tail)
- Omni Evolution (Ben 10, X-Men: Evolution)
- The Omnitrix Hero (My Little Pony: Equestria Girls, Ben 10)
- The Omniverse Event (Calvin and Hobbes, Yu-Gi-Oh!, Star Trek: Voyager, Bernice Summerfield, many more planned)
- On a Backwater Planet, a Commander Builds a Metal Extractor (Commander (Drich), Planetary Annihilation)
- On a Clear Day You Can See Forever, (Ranma ½, Sailor Moon, Ah! My Goddess)
- On Black Wings Darkscythe Drake (Harry Potter, Fairy Tail)
- On the Illusion of Might (Halo, Mass Effect)
- On the Run (Smallville, The Fast and the Furious)
- Once Upon A Shooting Star (Rock Band/Guitar Hero, Super Mario Bros., Pokémon, Mortal Kombat, Sonic the Hedgehog, Banjo-Kazooie, Tales of Symphonia, Final Fantasy, The Legend of Zelda, Team Fortress 2)
- Once Upon a Supernatural Time (Supernatural, Once Upon a Time (2011)).
- Once We Are Descendants (Once Upon a Time (2011), Descendants)
- One and Only Son (Code Geass, Mobile Suit Gundam 00)
- One Door Closes Another Opens (The Owl House, Percy Jackson and the Olympians)
- One Foot – Another Multiverse SI (Marvel Universe, Bleach, Soul Eater, Avatar: The Last Airbender)
- One Helluva Broken Day (SCP Foundation, Hellaverse)
- One helluva time with Iruma kun (Welcome to Demon School! Iruma-kun, Hellaverse)
- 100 Percent Hero (Mob Psycho 100, My Hero Academia)
- One Knuckleheaded Glutton (Naruto, Hellaverse)
- One Man, One Menu, Multiversal Madness (Massive Multiplayer Crossover)
- One Punch Deku (My Hero Academia, One-Punch Man)
- One Punch-Gamer (One-Punch Man, Sword Art Online)
- One to Find All (My Hero Academia, RWBY)
- Onegai, Megami-Sama! (Ah! My Goddess, Please Teacher!)
- One Thousand Days (Maken-ki!, Negima! Magister Negi Magi)
- One Who Walks the Path of Night (Digimon, Puella Magi Madoka Magica)
- Oni Ga Shiku Series (My Hero Academia, Like a Dragon)
- On Missing Limbs (Worm, Metal Gear Solid V: The Phantom Pain)
- The Onyx Stars (Halo, Mass Effect)
- Oogway's Little Owl (Kung Fu Panda, Worm)
- The Open Door (Neon Genesis Evangelion, Warhammer 40,000-centric Massive Multiplayer Crossover)
- Opening Dangerous Gates (Fairy Tail, Bleach)
- Operation ECLIPSE (Lermis) (Sonic the Hedgehog, Mass Effect)
- Operation Exchange (Fullmetal Alchemist, SPY×FAMILY)
- Operation FOSTERS (Codename: Kids Next Door, Foster's Home for Imaginary Friends)
- Operation Genos (Mobile Suit Gundam SEED, Touhou Project)
- Operation Homecoming (My Little Pony: Friendship Is Magic, S.T.A.L.K.E.R.)
- Origins (Mass Effect, Star Wars, Borderlands)
- Origin Story (Power Girl, Buffy the Vampire Slayer, set during Marvel's Civil War)
- ...Or is He Both? (The Immortal Hulk, The Rising of the Shield Hero)
- Oscura's Encore the Movie: Return to the Boiling Isles (The Owl House, Kamen Rider)
- Oskar Osäker: True Omnivore (My Little Pony: Friendship Is Magic, [PROTOTYPE])
- The Otherworld Anthology (Western Animation Massive Multiplayer Crossover)
- The Otherworld Series (Anime Massive Multiplayer Crossovers)
- Out of the Corner of the Eye (Jackie Chan Adventures, Cthulhu Mythos)
- Outbreak On The Isles (The Owl House, [PROTOTYPE])
- Outcry (Dark Souls, Worm)
- Outsiders (The Familiar of Zero, Pokémon)
- Overdrive (Hazbin Hotel, JoJo's Bizarre Adventure)
- OverGamer (Sword Art Online, Overlord)
- Overlady (The Familiar of Zero, Overlord)
- The Owl Chronicles (American Dragon: Jake Long, Jackie Chan Adventures, Kim Possible, The Owl House)
- The Owl and The Frog (The Owl House, Amphibia)
- The Owl House of Amphibia (The Owl House, Amphibia)
- Owl House Prime (The Owl House, Transformers: Prime)
- Of Owls and Robots (The Owl House, Mega Man (Archie Comics))
- Owlphibia Falls: The Novel Edition (The Owl House, Amphibia, Gravity Falls)
- The Owl Sanctum (crossover The Owl House and Doctor Strange (2016))
- An Owl's Beacon (RWBY, The Owl House)
- Owls, Frogs and Demons (Gravity Falls, Amphibia, The Owl House, and Hazbin Hotel)
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- Pale-Snake (JoJo's Bizarre Adventure, Worm)
- The Pandora Incident (Avatar, Warhammer 40,000)
- Paper Mario X (Paper Mario, The Legend of Zelda, Sonic the Hedgehog, Kirby, Metroid)
- Paradoxical (Worm, Destiny)
- Paradoxus (WinxVerse, World of Warcraft)
- Paragons of Virtue and Glory (My Hero Academia, RWBY)
- Parallel Processing (Titanfall, Mass Effect)
- Paths Of Our Fathers (Kingdom Hearts II, Final Fantasy VII)
- Patroni In Winterfell (A Song of Ice and Fire, Harry Potter)
- The PAW Patrol And The Octonauts (PAW Patrol, The Octonauts)
- The Pawn of Grisaia (High School D×D, The Fruit of Grisaia)
- Pawprints In DC (Hetalia: Axis Powers, Young Justice (2010))
- Peace Day Never Came (Fallout/Metal Gear)
- PenJackson: A Traveler for Camp Half Blood (Percy Jackson and the Olympians, The Pendragon Adventure)
- Peace of Mind, Piece of Heart (Infinity Train, She-Ra and the Princesses of Power, Steven Universe: Future)
- People Like Us (Joker (2019), Taxi Driver)
- Percy Jackson: Spirits (The Legend of Korra, Percy Jackson and the Olympians)
- Percy Meet Dora (Percy Jackson and the Olympians, Dora the Explorer)
- The Perfect Assassin? (Columbo, Hitman)
- The Persistence Of Loss (Kingdom Hearts, Golden Sun)
- Persona 4: Snowy Spring (Persona 4, Senran Kagura)
- Persona EG (My Little Pony: Friendship Is Magic, Persona)
- Perspective (Roving Otter) (BoJack Horseman, Rick and Morty)
- Perturabo in Remnant (Warhammer 40,000, RWBY)
- Peter Parker Needs a Hug (Spider-Man and Batman)
- Petunia Evans, Tomb Raider (Harry Potter, Tomb Raider)
- The Phantom Data Saga (Bakugan, Miraculous Ladybug, Sailor Moon)
- The Phantom and Ladybug (Danny Phantom, Miraculous Ladybug)
- Phantom Dragon Rising (Persona 5, Like a Dragon)
- PHANTOM FORCE, Goin' Ghost Retold (Massive Multiplayer Crossover)
- A Phantom's Ghoul School Sweetheart (Danny Phantom, Scooby-Doo and the Ghoul School)
- A Phantom's Love and Courage (Danny Phantom, Sailor Moon)
- Phantom Thieves of Hope (Danganronpa, Persona 5)
- Phantom Titan (Danny Phantom, Teen Titans (2003))
- Phantom vs Aliens: Hot Ectoplasma! (Danny Phantom, The Fairly OddParents!)
- Phineas and Ferb in Dimmsdale (Phineas and Ferb, The Fairly OddParents!)
- The Phoenix Connexion (Worm, Counter-Strike)
- Phoenix's SSBB Case Files (Ace Attorney, Super Smash Bros.)
- The Phoenician of Blood and Fire (Warhammer 40,000, A Song of Ice and Fire)
- Pillars of Sand (Avatar: The Last Airbender, Worm)
- Pink Alert 3 (My Little Pony: Friendship Is Magic, Command & Conquer: Red Alert 3)
- Pirate Meets Gebler (Xenogears, One Piece)
- The Pirate's Soldier (Mobile Suit Gundam Wing, Tenchi Muyo!)
- The Pixie of the Hidden Leaf (Naruto, The Saga of Tanya the Evil)
- A Place in My Dreams (Sword Art Online, Campione!}
- Planet of the Cats (Planet of the Apes, Cat Planet Cuties)
- Playing for Keeps (Kingdom Hearts, The World Ends with You)
- Playing With Legos (Supreme Commander, Worm)
- Plumbers, Farmers, and Mercenaries (Super Mario Bros., Harvest Moon 1, Team Fortress 2)
- Plus Ultra is Pretty Disco (My Hero Academia, Disco Elysium)
- Point Me at the Skyrim (The Elder Scrolls V: Skyrim, Ward)
- Points of Familiarity (The Familiar of Zero, Neon Genesis Evangelion)
- Pokémon Crossing (Animal Crossing, Pokémon)
- Pokémon: Harmony and Chaos (Pokémon, My Little Pony: Equestria Girls)
- Pokémon: Loud Version Kanto (The Loud House, Pokémon)
- Pokémon: Remix Hearts (Pokémon, BlazBlue)
- Pokemon Secret Journeys (Pokémon, Marvel Comics, Sonic the Hedgehog, Digimon Adventure, Power Rangers, Godzilla, and Disney Ducks)
- The Pokémon Squad (Pokémon, KaBlam!, Doug, Barney & Friends, The Penguins of Madagascar, Hetalia: Axis Powers, Sesame Street, Dora the Explorer, and others, though non-Pokémon franchises started to get downplayed as time went on)
- Policing Middle Earth (Discworld, The Lord of the Rings)
- Polytrix's Requiem (KPop Demon Hunters, The Owl House)
- Ponies One Half (My Little Pony: Friendship Is Magic, Ranma ½)
- A Pony Out of Place (My Little Pony: Friendship Is Magic, Pokémon the Series)
- Pony Space (My Little Pony: Friendship Is Magic, Dead Space)
- Portalborn (The Elder Scrolls V: Skyrim, Portal)
- A Possible Encounter for a Phantom (Danny Phantom, Kim Possible)
- Postnuptial Disagreements (Sekirei, Fate/Zero, Fate/stay night)
- Power Rangers: Victorious (Victorious, Power Rangers)
- Power Rangers Zodiac Force (Kim Possible, Power Rangers)
- The Prayer Warriors (Percy Jackson and the Olympians, Harry Potter, though In Name Only)
- Prehistoric Park: Returned from Extinction (Prehistoric Park, Walking with Dinosaurs)
- Pretty Cure: Magic of the Rainbow (Pretty Cure, Rainbow Magic)
- Pretty Guardian Sailor Pokémon (K-On!, Pokémon, Cherry Tree High Comedy Club, Wonder Momo)
- Pretty Princess Powerhouses (Disney Princess, Pokémon)
- The Prime of Fairies (Transformers, Fairy Tail)
- The Princess And The Pig Keeper (crossover with Snow White and the Seven Dwarfs and The Black Cauldron)
- Princesses of Power and Robots in Disguise (She-Ra and the Princesses of Power and Transformers)
- Primal (Final Fantasy XIV, Worm)
- Prince of Darkness No More (Castlevania, Touhou Project, Doom, A Super Mario Thing)
- The Prince Who Was Promised (Harry Potter, Game of Thrones)
- Princess Maniacs (Animaniacs, Disney Princess)
- Princess Tales (Disney Princess, Sofia the First, Star vs. the Forces of Evil, Elena of Avalor, Tangled: The Series)
- The Princesses of Remnant (She-Ra and the Princesses of Power, RWBY)
- The Prodigy Fandom (Super Smash Bros., Massive Multiplayer Crossover)
- Prospit Nights (Homestuck, L.A. Noire, Halo, Mass Effect, BioShock 1, BioShock Infinite, Red Dead Redemption, Doom Patrol, Get Smart, Dead Poets Society, Final Fantasy XIII-2)
- Prinz Von Sommerhoffnung (Captain Ersatz/Not Using the "Z" Word/Writing Around Trademarks My-HiME-centric severe AU Massive Multiplayer Crossover)
- Project Arashi (Love Hina, Negima! Magister Negi Magi, Halo)
- Project Bluefield (Massive Multiplayer Crossover)
- Project Ignition (Armored Core, Muv-Luv Alternative)
- Project YVP (Pokémon, Yu-Gi-Oh!)
- Protectors of the Plot Continuum (Massive Multiplayer Crossover)
- Protoculture Effect (Mass Effect, Robotech)
- Prytaneum (Percy Jackson and the Olympians, Is It Wrong to Try to Pick Up Girls in a Dungeon?)
- Psi Effect (Mass Effect, X-COM)
- PSI Ponify (EarthBound (1994), My Little Pony: Friendship Is Magic)
- Puella Arcana Somniator Madoka (Persona, Puella Magi Madoka Magica)
- The Pure Spark (Sailor Moon, The Transformers)
- The Purple Bandit ('Red Dead Redemption 2, Five Nights at Freddy's'')
- Pyrrhic Victory (BuffetAnarchist) (RWBY, Worm)
