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Q
- Queen of Blood (Worm, Castlevania)
- Queen of the Swarm (Worm, StarCraft)
- Queen of the Void (The Familiar of Zero, Magic: The Gathering)
- The Queen Who Fell To Earth (Dragonriders of Pern, Harry Potter)
- The Quick and Easy Path (Star Warsnote , Star Trek: Voyagernote )
- Quick to the Triggernote (Power Rangers, Kamen Rider)
- A Quiet Life (Worm, JoJo's Bizarre Adventure)
- Quiet Life with Monster Girls (Monster Musume,JoJo's Bizarre Adventure)
- A Quincy's Fairy Tail (Bleach, Fairy Tail)
- Quite a Glittering Assemblage (Kingdom Hearts, Gotham, True Blood, Once Upon a Time, and others)
- Quoth the Raven (Naruto, Tolkiens Legendarium)
R
- Rabbit of the Moon (Is It Wrong to Try to Pick Up Girls in a Dungeon?, Bloodborne)
- Rachel The Vampire Slayer (Animorphs, Buffy the Vampire Slayer)
- Rainbow in Sunnydale (Buffy, Tom Clancy's Ryanverse)
- Rainbow Rocket Ed-scendant (Ed, Edd n Eddy, Pokémon)
- Ranma Club (Ranma ½, Winx Club)
- Rap Battles (Massive Multiplayer Crossover)
- Raspephabio (Fullmetal Alchemist, Final Fantasy, and others)
- The Raven of Crystal Cove (Scooby-Doo! Mystery Incorporated, Teen Titans)
- React Watch Believe Yikes (RWBY, Red vs. Blue)
- The Reactsverse (RWBY, Fire Emblem: Awakening, Puella Magi Madoka Magica, Persona)
- Realm of Entwined Science and Sorcery — Academy City (Fate/Grand Order, A Certain Magical Index)
- Reaper (Darker than Black, Worm)
- Reapers Among Fairies (Bleach, Fairy Tail)
- The Reaping of Hatsune Miku (Vocaloid, The World Ends with You, Black★Rock Shooter)
- Reap the Pain (Naruto, Bleach)
- Reborn (Kung Fu Panda, The Crow (1994))
- Recognized (Danny Phantom, Young Justice (2010))
- The Red Dragon's Saber (Fate/stay night, High School D×D)
- The Red Dragon Samurai (High School D×D, Samurai Jack)
- Redemption (Doom, Hazbin Hotel'')
- Red like Blood (Hellsing, RWBY)
- A Red Rose in the Blue Wind (Sonic the Hedgehog, RWBY)
- Red Soul (Puella Magi Madoka Magica, Dark Souls)
- Red vs. Blue: Reaction (Red vs. Blue, RWBY)
- Reflections Lost on a Dark Road (Ranma ½, Teen Titans (2003), X-COM)
- The Reluctant Beautiful Dreamer (Sailor Moon, The Transformers)
- Remnant and Runeterra: A Tale of Two Worlds (RWBY, League of Legends)
- Remnant Inferis: DOOM (RWBY, Doom (2016))
- RemnantMoonview (Young Justice (2010), Five Nights at Freddy's)
- Remnant of a Worm (RWBY, Worm)
- Renegade (Mass Effect, Command & Conquer: Tiberian Series)
- Renamon Who? (Digimon Tamers, Jackie Chan Adventures)
- The renegade hero!!!....Invader Zim? (Invader Zim, Atomic Betty, Lilo & Stitch)
- The Requiem of Remnant (JoJo's Bizarre Adventure, RWBY)
- Respect (Smile Pretty Cure!, Puella Magi Madoka Magica)
- Resurgence Series (The Twilight Saga, Heroes
- The Return (Ranma ½, Sailor Moon)
- Returning Welsh Dragon (High School D×D, Fate/Grand Order)
- The Return of LJN (Phineas and Ferb, The Angry Video Game Nerd)
- Return to Atlantica (Pokémon, The Little Mermaid (1989), Spyro the Dragon, Spore, Godzilla, Super Mario Bros., Star Fox, Beast Wars, Dinosaur King, Jurassic Park, Monster Hunter, others)
- Revenge of Lavan (My Little Pony: Friendship Is Magic, Sonic the Hedgehog with some elements [monsters, mecha and powers] of Super Sentai and Pretty Guardian Sailor Moon)
- Reverse Engineering for Fun and Profit (Anime/Manga/Literature/Videogame multicross)
- Reunions Are a Bitch (Battlestar Galactica (2003), Stargate-verse)
- The Review Team (Multiple Fandoms)
- Revival (The Loud House, The Cthulhu Mythos)
- Riddle Me This Fillmore (Batman, Fillmore!)
- Rick and The Loud House (Rick and Morty, The Loud House)
- Rick and Morty New Drama Adventures (Rick and Morty, Total Drama)
- Ring-Maker (Worm, The Lord of the Rings)
- Rise of the Brave Tangled Dragons (Tangled, Brave, How to Train Your Dragon, Rise of the Guardians and more)
- Rise of the Galeforces (The Incredibles, Portal, Jurassic Park, Megamind, Donkey Kong Country, and a lot of honorable mentions)
- Rise of the Sword and the Shield (The Rising of the Shield Hero, Senran Kagura)
- Rise of Team Zodiac (Gravity Falls, My Hero Academia)
- Rise of the Unicorn (Mobile Suit Gundam Unicorn, Infinite Stratos)
- Rising of the Sleeping Soldier (Castlevania (2017), The Rising of the Shield Hero)
- Rising Sun (Marvel Cinematic Universe, Big Hero 6)
- Rising Sun Series (Harry Potter, Riordanverse, Bungo to Alchemist and more)
- Roanapur Connection (Code Geass, Black Lagoon)
- The Road to Cydonia (Ranma ½, X-COM: UFO Defense)
- A Robin's Nest (My Hero Academia, Batman)
- Robin 10 (Robin, Ben 10)
- The Rod Squad (briefly crosses Chip 'n Dale: Rescue Rangers over with Kojak)
- The Rogue Symbiote (X-Men, Spider-Man)
- Roll of the Dice (Dungeons & Dragons, My-HiME)
- Roller Brawl: The Mega Cyborg (Mega Man (Classic), Skylanders)
- Rorschach In Equestria (My Little Pony: Friendship Is Magic, Watchmen)
- ROTBTFD Star Wars Series (Brave, How to Train Your Dragon, Rise of the Guardians, Tangled, Disney, DreamWorks Animation, Star Wars)
- Rosario to Kiva (Kamen Rider Kiva, Rosario + Vampire)
- A Rose's Scales (RWBY, Inheritance Cycle)
- Roses and Ladybugs (Samurai Jack, Steven Universe)
- The Royal Protector (Frozen, Tangled)
- RunawayRonpa (The Runaway Guys, featuring plot ideas and concept of Danganronpa)
- RWBY: Aqua's Mission (Kingdom Hearts, RWBY)
- RWBY: Dual Eclipse (Disgaea, RWBY)
- RWBY: Epic of Remnant (RWBY, Fate/Grand Order)
- RWBY: Fate Disaster (RWBY, Fate/Grand Order)
- RWBY: Ghost of Remnant (Kamen Rider Ghost, RWBY)
- RWBY Zero (Fate/stay night, RWBY)
S
- The Sabbat (Rise of the Guardians, The Nightmare Before Christmas)
- Saerang (A Song of Ice and Fire, The Silmarillion)
- The Saga Of Tanya The Firebender (The Saga of Tanya the Evil, Avatar: The Last Airbender)
- Sailor Hellblazer (Sailor Moon, Hellblazer)
- Saints and Sinners (Worm, Ghost Rider)
- Sagittarius (Destiny, Inheritance Cycle, Transformers, Monster Hunter, Warhammer 40,000)
- Stargazer (Destiny, Inheritance Cycle)
- No stars in sight (rewrite of Stargazer)
- Seeker (Keltoi) (Destiny, Transformers)
- Stargazer (Destiny, Inheritance Cycle)
- Saiyan in Brockton (Dragon Ball, Worm)
- A Salaryman in Nobuna's Court (Kamen Rider, The Ambition of Oda Nobuna)
- SAPR (My Little Pony: Equestria Girls, RWBY)
- Saruman of Many Devices (The Lord of the Rings, The General Series)
- SAVETHEM (Lonely Wolf Treat, Syrup and the Ultimate Sweet)
- Say It Thrice (Danny Phantom, Beetlejuice)
- School Idol Days (Love Live!, School Days)
- Schwarz Und Weiss (Pokémon [specifically Pokémon Black and White], Puella Magi Madoka Magica)
- Scion of Sorcery (Harry Potter, Doctor Strange (2016))
- Scott Pilgrim vs. Snow Flower and the Secret Hall Pass (Durarara!!, Hetalia: Axis Powers, Baccano!, Fullmetal Alchemist, Gintama)
- Scrambleverse: A Fic for All and None (Homestuck), Massive Multiplayer Crossover
- TEH SCREAMING OF THE LAMBS (The Silence of the Lambs, Arthur, Jurassic Park)
- se vis pacem para bellum (The Lord of the Rings: The Rings of Power, John Wick)
- Searching for My Master (Chrono Cross, Chrono Trigger)
- The Season's My Reason (mass crossover, with Delicious Party♡Pretty Cure at its core)
- Seraphina's Tea Quest (mass crossover)
- Second Chance (Code Geass, Cross Ange)
- The Search for Victory (Marvel Cinematic Universe, Stargate-verse)
- The Second Age of Heroes (Zack Snyder's Justice League, The Camp Half-Blood Series)
- The Second Archon War (Worm, Genshin Impact)
- The Secret Keeper series (Harry Potter, The Twilight Saga)
- The Secret Life of Dolls (Dollfic by Cleolinda Jones)
- The Secret Life of Punzie (Frozen, Tangled)
- The Secret Return of Alex Mack (mass crossover, with The Secret World of Alex Mack at its core)
- See the Zone and Survive (My Little Pony: Friendship Is Magic, S.T.A.L.K.E.R.)
- Seinen Kakumei Utena (Revolutionary Girl Utena, Penguindrum)
- Senki Zesshou Symphogear: WXD Unlimited (Worm, Symphogear'')
- Senran Persona: Ninjas of Hearts (Persona 5, Senran Kagura)
- The Senshi Files (Sailor Moon, The Dresden Files)
- Sequel to Kremzeek (Sailor Moon, The Transformers)
- Seraphim (High School D×D, Worm)
- Serenity Malfoy and the Hogwarts Education (Sailor Moon, Harry Potter)
- The Serpent’s Vow (Yu-Gi-Oh!, Stargate SG-1)
- Servants of Remnant (RWBY, Fate/Grand Order)
- Seven Days in Corona (Brave, Tangled, The Hunchback of Notre Dame)
- Seven Days Survivor (Devil Survivor, Persona 3, Persona 4)
- Sew Cute Pretty Cure (Lalaloopsy, Pretty Cure)
- Sexy Lowblood Gamzee (Hiveswap, Homestuck)
- The Shadow of Angmar (Harry Potter, The Lord of the Rings)
- Shadow of Zero (Dungeons & Dragons, The Familiar of Zero)
- Shadows of the Azure (BlazBlue, Persona 4. Shades of Persona, Persona 2, Persona 3)
- Shadow Beyond The Wall ' (Tolkien's Legendarium, Game of Thrones)
- Shadows of Giants (Godzilla, My Little Pony: Friendship Is Magic)
- A Shadow of the Titans (Jackie Chan Adventures, Teen Titans (2003))
- Shang Chi And The American Dragon (crossover with Shang-Chi and American Dragon: Jake Long)
- Shattered Skies: The Morning Lights (Sailor Moon, Cardcaptor Sakura, Pretty Cure, Lyrical Nanoha, Puella Magi Madoka Magica)
- Shattered Empire(Star Wars, Massive Multiplayer Crossover)
- Shelluva Boss (Teenage Mutant Ninja Turtles (2003), Hellaverse)
- The Shattering of Oz (Return to Oz, Wicked)
- Shepherd Of The Stars (Mass Effect, Sword of the Stars)
- She Who Skitters In Shadows (Worm, Exalted)
- She Who Wields the Holy Sword (Worm, Fate/stay night)
- The S.H.I.E.L.D. Codex (Thor, Agents of S.H.I.E.L.D.)
- The Shield's Dragon (Yakuza 6, The Rising of the Shield Hero)
- Shinji and Warhammer40k (Neon Genesis Evangelion, Warhammer 40,000)
- Shinji Ikiryo (Neon Genesis Evangelion, Danny Phantom)
- Shinigami Phantom (Danny Phantom, Bleach).
- Shinji and the Doctor (Doctor Who, Neon Genesis Evangelion)
- Shinnen New Year (Guilty Crown, Kanius Production Abridged, YuYuGiDigiMoon, Digimon Fusion Kai, Guilty Crown: The Lost Kingdoms, Digimon Accel Stream, Various Anime and other popular culture)
- Shinobi of the High Seas (Naruto, One Piece)
- Shin Persona Evangelion (Neon Genesis Evangelion, Persona)
- Shin-YuYuGiDigiMoon (YuYu Hakusho, Yu-Gi-Oh!, Digimon, Sailor Moon. Reboot of YuYuGiDigiMoon.)
- Ships Dance Across The Sky (Percy Jackson and the Olympians, Star Trek: Lower Decks)
- Showa & Vampire (Rosario + Vampire Massive Multiplayer Crossover)
- The Shrouded Path (Kingdom Hearts, Silent Hill)
- Shy Girl (Super Mario Bros., Worm)
- Siblings of Doom! (The Loud House, Invader Zim)
- Silence Falls (Worm, Sailor Moon)
- Silly but Killy (Warhammer 40,000, Mass Effect)
- A Silver Legacy (My Hero Academia, One Piece)
- The Silver Raven (Devil May Cry, The Owl House)
- The Silverscale Arena (A Not-Safe-for-Work Ultimate Showdown of Ultimate Destiny)
- The Simpsons Vs Arthur (The Simpsons, Arthur)
- Sinner Blue Darks Misfortune (Soul Nomad & the World Eaters, BlazBlue)
- Simon and Reimu (Touhou Project, Adventure Time)
- Six (Deadpool, The Legend of Zelda, Harry Potter, Mortal Kombat, Nazi Zombies, My Little Pony: Friendship Is Magic)
- Skitterdoc 2077 (Worm, Cyberpunk 2077)
- A Skittering Heart (Kingdom Hearts, Worm)
- Skool Hooligans (How to Train Your Dragon, Vikingskool)
- The Slayer Prophecy (Buffy the Vampire Slayer, Batman)
- Sleeping with the Girls (Tenchi Muyo!, Love Hina, Ah! My Goddess, Lyrical Nanoha, Ranma ½, Those Who Hunt Elves, possibly others)
- Slender Man vs Siren Head (The Slender Man Mythos, Trevor Henderson Mythos)
- Slimer in the Machine (The Real Ghostbusters, Transformers: Generation 1)
- SmallvilleX: Evolution (Smallville, X-Men: Evolution)
- Snakepit (Stargate SG-1, The Draka)
- Snic nd the OSrailian resrant (Sonic The Hedgehog, Sonic the restaurant)
- The SOLDIER General's Self-Saving Shizun (The Scum Villain's Self-Saving System: Ren Zha Fanpai Zijiu Xitong, Final Fantasy VII)
- Someone has heard them scream (Mass Effect, Alien vs. Predator)
- Something Wicked (Spring Awakening, Harry Potter)
- Something Wicked This Way Comes (Overlord (2012), RWBY)
- Somnium (Disney Animated Canon, Disney Princess, Enchanted)
- Song of a Northern Sorcerer (A Song of Ice and Fire, Star Wars: The Old Republic)
- A Song of Ice and Fires That Weren't All My fault (The Dresden Files, A Song of Ice and Fire)
- A Song of Ice, Fire and Heart (Kingdom Hearts, Game of Thrones)
- A Song of Ice, Stone, Wind and Flame (A Song of Ice and Fire, Avatar: The Last Airbender)
- A Song of Light and Dark (Final Fantasy XIV, Star Wars)
- A Song Of Magic (Naruto, A Song of Ice and Fire)
- Son of the Seven Kingdoms (A Song of Ice and Fire, The Elder Scrolls)
- Songs of the Spheres (Massive Multiplayer Crossover)
- Sonic and the Dept of Hotness
- Sonic and Equestria Girls (Sonic the Hedgehog, My Little Pony: Equestria Girls)
- Sonic, grab my x! (Doctor Who, Sonic the Hedgehog)
- Sonic Generations: Friendship Is Timeless (My Little Pony: Friendship Is Magic, Sonic Generations)
- Sonic the Hedgehog: Make America Great Again (Sonic The Hedgehog, Space Jam, Garfield, and many more)
- Son of the Warp (Percy Jackson and the Olympians, Warhammer 40,000)
- SOS Pretty Cure (Haruhi Suzumiya, Pretty Cure)
- Soul Chess (Bleach, Code Geass)
- Soul Hunter (Bleach, RWBY)
- Souls Reborn (One Piece, Naruto)
- Sovereign (Fate/EXTRA, Overlord (2012))
- The Spacebattles Multiverse Project (Massive Multiplayer Crossover)
- Space Ninja Summer Camp (Worm, Warframe)
- Sparkgate: Agatha and the Grasp of the Serpent God (Girl Genius, Stargate SG-1)
- A Spark of Genius (Buffy the Vampire Slayer, Justice League, Girl Genius)
- A Spark of Ice and Fire (A Song of Ice and Fire, Girl Genius)
- Spark to Spark, Dust to Dust (RWBY, Transformers)
- A Spartan in Westeros (Game of Thrones, Halo)
- Special (Glee, Marvel Universe)
- A Special Kind of Magic (The Rising of the Shield Hero, Marvel Cinematic Universe)
- Spiders and Magic: Rise of Spider-Mane (Spider-Man, My Little Pony: Friendship Is Magic)
- Spider-Man and the Ninja Turtles (Spider-Man, Teenage Mutant Ninja Turtles (2012))
- Spider-Man and Power Girl (Spider-Man, Power Girl)
- Spider Man The Young Avenger (Spider-Man, Young Avengers)
- Spider-Ninja (crossover with Spider-Man and Teenage Mutant Ninja Turtles)
- Spider-X & sequels (Spider-Man, X-Men: Evolution)
- Spider, Slayer, Vampires and Avengers (Buffy the Vampire Slayer, Marvel Cinematic Universe)
- Spidey vs. the Forces of Evil (Spider-Man, Star vs. the Forces of Evil)
- Spongebob 2019 (Nickelodeon characters, Beavis and Butt-Head)
- SSFL (Massive Multiplayer Crossover)
- Stand and Deliver (Dr.Indigo) (Star vs. the Forces of Evil, JoJo's Bizarre Adventure)
- Star Force D×D (High School D×D, Mega Man Star Force)
- A Starstruck, Phantasmic Romance (Danny Phantom, Teen Titans (2003))
- Star Wars EQG (Star Wars, My Little Pony: Equestria Girls)
- Star Wars: Force of Nature (Star Wars Rebels, Godzilla)
- Star Wars: Light in Dark Time (Back to the Future, Doctor Who, Star Trek, Harry Potter, Alien, Shrek, Avatar: The Last Airbender, Star Wars)
- Star Wars: Twilight of the Force (Star Wars, My Little Pony: Friendship Is Magic)
- Star Wars vs Warhammer 40K (Star Wars, Warhammer 40K)
- Starcrossed (Star Wars, Star Trek)
- Stardust (My Little Pony: Friendship Is Magic, XCOM: Enemy Unknown)
- Starfall (Star vs. the Forces of Evil) (Star vs. the Forces of Evil, Gravity Falls)
- Stargate Equestria (Stargate SG-1, My Little Pony: Friendship Is Magic)
- Stargate Etheria (Stargate SG-1, She-Ra and the Princesses of Power)
- Starlight Series (Starlight, Aftermath [Lilo & Stitch, Star Trek], A Trip to Japan [Lilo & Stitch, Cardcaptor Sakura])
- Starry Eyes (Worm, Cthulhu Mythos)
- Stars Above (Lucky Star, Puella Magi Madoka Magica)
- Stars Fade (Mass Effect, Dragon Age)
- Starships Don't Go Indoors! (Mass Effect, R-Type)
- The Stepbrother Sitch (Kim Possible, Phineas and Ferb)
- Steven Universe: and the Hunters of Arcadia (Steven Universe,Trollhunters)
- A Sticky Situation (Digimon Tamers, Star Wars: The Clone Wars, Pokémon, Harry Potter, Fairy Tail, The Lord of the Rings, Digimon Fusion)
- Stitches (Fate/stay night, Bleach)
- Stone and Starfire (Cardcaptor Sakura, Magic Knight Rayearth)
- A Storm of Chaos: A Doctor Whooves Adventure (Doctor Who, My Little Pony: Friendship Is Magic)
- Storms Overhead (The Familiar of Zero, inFAMOUS)
- Stormwolf Adventures (Ace Attorney, Ghosts 'n Goblins, The Legend of Zelda, One Piece, Star Wars, The Twilight Saga)
- The Story to End All Stories (Doctor Who, The Hunger Games, Star Wars, The Neverending Story, Mystery Science Theater 3000, etc.)
- Straight Edge (Fate/stay night, Worm)
- Strategic Cyborg Evangelion (Neon Genesis Evangelion, Half-Life, Mobile Suit Gundam)
- Stranger Things 3: The Wrath of Michael Myers (Halloween, Stranger Things'')
- Strawberry Meets Sonic The Hedgehog (Sonic the Hedgehog, Strawberry Shortcake)
- Stray Dog Records (Bungo Stray Dogs, Magia Record: Puella Magi Madoka Magica Side Story)
- Strength of an Honest Soul (Darksiders, RWBY'')
- The Strings We Pull (OneShot, Deltarune, OFF, Purrfect Apawcalypse, Night in the Woods, The Hex, Inscryption, The Magnus Archives'')
- A Subtle Knife (Worm, Young Justice (2010))
- Sudden Contact (Mass Effect, StarCraft)
- Suicidal Overconfidence (Central Park, Marvel Universe)
- A Study In Magic (Sherlock, Harry Potter)
- Summer and Winter: (One Piece, Rise of the Guardians)
- A Supe of a Man (Superman, The Boys (2019))
- The Super Friend Squad (The DCU, She-Ra and the Princesses of Power)
- Super Magica Wars (Magical Girl themed Massive Multiplayer Crossover)
- Super Milestone Wars 3 The Supetastic 6 Rises (Massive Multiplayer Crossover)
- Super Network Wars (Massive Multiplayer Crossover)
- Super RWBY Sisters (Super Mario Bros., RWBY)
- Superman Tenchi The Inhuman Condition (Tenchi Muyo!, Superman)
- The Supermen (Resident Evil games and Justice League of America comics)
- Supernatural Taisen (Stargate SG-1, Lyrical Nanoha, RahXephon, Godzilla, Hellsing, Ultraman Mebius, Hellboy, Super Robot Wars)
- The Superwomen of Eva series (Neon Genesis Evangelion, and DC Comics or Marvel Comics)
- Superwomen of Eva: Emerald Fury
- Superwomen of Eva: Spirit
- Superwomen of Eva: Lilith's Herald
- Superwomen of Eva: Treacherous Web
- Superwomen of Eva: The 4th Degree
- Superwomen of Eva: American Dream
- Superwomen Of Eva Fiery Return
- Superwomen of Eva: Storm Bringer
- Superwomen of Eva 2: Emerald Courage
- Superwomen Of Eva 2 Lone Heir Of Krypton
- Superwomen of Eva 2: Amazing Amazon
- Superwomen of Eva 2: Dark Lady of Tokyo-3
- Superwomen of Eva 2: The Magic Touch
- Superwomen of Eva 2: Hunter's Legacy
- Superwomen of Eva 2: Blue Defiance
- Superwomen of Eva 2: Girl of Steel
- Superwomen of Eva 2: The Hand of Fate
- Superwomen of Eva 2: The Ultimate Rush
- Superwomen of Eva 2: Unfinished Business
- Superwomen of Eva 2: Electric Return
- Superwomen Of Eva 2 Soaring High
- Superwomen of Eva: Legacies: Batgirl Beyond
- Superwomen of Eva: Legacies: New Daughter Of Krypton
- Superwomen of Eva: Legacies: Marvelous Future
- Superwomen of Eva: Legacies: True Blue
- Sure as the Setting Sun (Mob Psycho 100, My Hero Academia)
- Survivability (Bleach, Dong Bang Shin Ki, Super Junior, Big Bang, SHINee, B2ST, other K-Pop characters)
- A Survivor Is Born (Worm, Tomb Raider (2013))
- Suzumiya Haruhi No Index (Haruhi Suzumiya, A Certain Magical Index)
- Swapping Genres (Once Upon a Time, Marvel Cinematic Universe)
- The Swarm of War (Warhammer 40,000, StarCraft)
- Switching Places Evangelion (Ranma ½, Neon Genesis Evangelion, Tenchi Muyo!)
- Swords and Sorcery (Fate/stay night, Harry Potter)
- Swordsmen (Rurouni Kenshin, Highlander)
- Synesthesia (Worm, The World Ends with You)
T
- The Tabula Avatar Universe (a lot of Dungeons & Dragons-related materials — most notably Baldur's Gate, Buffy the Vampire Slayer, Stargate-verse, NCIS, and more)
- Tails of the Old Republic (Sonic the Hedgehog, Star Wars: Knights of the Old Republic)
- Takamachi Nanoha of 2814 (Lyrical Nanoha, DC Animated Universe, Sailor Moon, Negima! Magister Negi Magi, Cardcaptor Sakura, Fate/stay night, others)
- Tale of a Thief and His New Party (Daily Life with Monster Girl, Grimgar of Fantasy and Ash)
- A Tale Of Spirits (Rise of the Teenage Mutant Ninja Turtles, Avatar: The Last Airbender)
- The Tale Of The Devourers (Kenshi, Kuroinu: Kedakaki Seijo wa Hakudaku ni Somaru)
- A Tale of Wandering Stars (Yu-Gi-Oh! ARC-V, Final Fantasy XIV)
- Tales From The Blue Sea (Naruto, One Piece)
- Tales of Bleach: Unreal Society (Bleach, Tales of Symphonia)
- Tales of Fate (RWBY, Tales Series)
- Tales of the Otherverse (The DCU, Marvel Universe)
- Tangled Adventures in Arendelle (Frozen, Tangled)
- Tangled Fate (Ranma ½, Exalted)
- The Tangled Princess Bride (Tangled, The Princess Bride)
- Tanya's Hogwarts Adventure (Harry Potter, The Saga of Tanya the Evil)
- Tattered Capes Under a Shattered Moon (RWBY, Worm)
- Tech Infantry (Old World of Darkness, Starship Troopers)
- Teen Titans Tokyo (Ranma ½, Teen Titans (2003))
- Tekka Dread (Ranma ½, Tekkaman Blade, Van Dread)
- Tell Him All But The Truth (The Secret Show, Psychonauts)
- Temporal Anomaly (Kamen Rider Zi-O, Drakengard 3)
- 10 times the Aliens, 10 times the Chaos (Invader Zim, Ben 10)
- Ten Zero (Code Geass, Warframe)
- The Terminators: Army of Legend (The Legend of Spyro, Pokémon Black and White, My Little Pony: Friendship Is Magic, and many more)
- Terran Ingenuity (StarCraft, Mass Effect)
- Terrible (Hetalia: Axis Powers, The Hunger Games)
- Thaumaturgic Awakening (Worm, Fate/stay night)
- Theogony (Worm, God of War)
- The 40 (Massive Multiplayer Crossover between 40 media series (cartoons, anime, and manga), in a "Let's Watch Our Show" Plot)
- There's always more (Harry Potter, Rise of the Brave Tangled Dragons
- there will be music despite everything (Star Wars, Marvel Cinematic Universe)
- The Thessalonica Legacy (My Little Pony: Friendship Is Magic, BattleTech)
- A Thing of Vikings (primarily How to Train Your Dragon and Real Life history, but there are also some characters from the books, Brave, and Mulan)
- The New Recruit (Chronicle, The Avengers (2012))
- Thinking In Little Green Boxes (Deadpool (Marvel Universe), Harry Potter)
- A Thin Veneer (Star Trek, Babylon 5)
- The Thirteenth Tribe (Stargate, Battlestar Galactica (2003))
- This And That (Arcane, Library of Ruina)
- This Goddess Must Be Crazy (My Hero Academia, KonoSuba)
- This Means War Brahian (Harry Potter, The Twilight Saga, Maximum Ride, Rick Riordan's books)
- Thomas & Friends Equestria Girls Gold Dust and Harmony (Thomas & Friends, My Little Pony: Friendship Is Magic)
- Those Obnoxious Ghosts (Danny Phantom, Urusei Yatsura)
- Thousand Shinji (Neon Genesis Evangelion, Warhammer 40,000)
- Three Courageous Sweeps (The Transformers, She-Ra: Princess of Power)
- The Three Kings: Hunt (Yu-Gi-Oh!, Harry Potter)
- Three Special Steps (Incredibles 2, Meet the Robinsons)
- The Throne Of Heroes (Fate Series, RWBY)
- A Throne Nobody Wants (Fate/stay night, A Song of Ice and Fire)
- Through a Temple (Mass Effect, Star Trek: Deep Space Nine)
- Through the Eternities (RWBY, Magic: The Gathering)
- Through the Looking Glass (Battlestar Galactica (2003), Firefly)
- Thrower of the Dart (Artemis Fowl, Marvel Cinematic Universe)
- Thunder & Lightning (Pokémon, Super Mario Bros.)
- Thunder and Steel (Thor, Supergirl (2015), Smallville)
- Thu'um of a Distant Utopia (The Elder Scrolls V: Skyrim, Fate/stay night)
- Thy Good Neighbor (Bloodborne, A Song of Ice and Fire)
- Tiberian Eclipse (My Little Pony: Friendship Is Magic, Command & Conquer: Tiberian Series)
- Tiberium: The Fires of Terra (Mobile Suit Gundam SEED, Command & Conquer: Tiberian Series)
- The Tides Change Once More (Naruto, The Legend of Korra)
- Time Anomaly (Marvel Cinematic Universe, Doctor Who).
- Time Fixers: Nicktoons of the Future (SpongeBob SquarePants, Danny Phantom, The Adventures of Jimmy Neutron, Boy Genius, The Fairly OddParents!)
- Time Lords and Terror (Doctor Who, My Little Pony: Friendship Is Magic)
- Mines of Dragon Mountain (Same)
- Timeless Academia (My Hero Academia, Fate/Grand Order)
- The Timelord Brothers (Doctor Who, Phineas and Ferb)
- Their Midnight Revels (Downton Abbey, The Tempest)
- Timeslip (Worm, Ward)
- Titania Falls (Gravity Falls, Fairy Tail)
- Tired and Wired (Band of Brothers, The Pacific, Generation Kill)
- To a Merry Christmas (Disney Princess)
- To Be a (Miraculous) Master (Miraculous Ladybug, Pokémon)
- TOC (Worm, PAYDAY: The Heist)
- To Face the Wolf (Harry Potter, The Silmarillion)
- To Infinity (BIONICLE, Halo)
- To Kill a Precure (Death Note, HappinessCharge Pretty Cure!)
- Tokimeki PokéLive! and TwinBee (Pokémon, Love Live!, Tokimeki Memorial, TwinBee. Characters from other franchises do appear on occasion in both the lighthearted Seinen styled Slice of Life/Idol stories and the Shonen styled Side Stories.)
- to forget is unforgivable (My Hero Academia, Jujutsu Kaisen)
- To My Death I Fight (Bleach, Kill la Kill)
- To Shatter Fate (Bleach, (RWBY'')
- Tok'ra Apocalypse (Stargate-verse, Supernatural)
- Told That Devil to Take You Back (Supernatural, Wynonna Earp)
- Toon City Oklahoma (Saturday-Morning Cartoon in general, Cartoon Network, Disney XD, DreamWorks Animation and Nickelodeon}
- ToonSchool (Multi-Crossover for Cartoons and Anime, notables being Danny Phantom, The Adventures of Jimmy Neutron, Boy Genius, The Fairly OddParents!, The Amazing Spiez!, Pokémon, and many more)
- Toons Of A Feather a crossover of many cartoons that most people dislike, notably Bread Winners, Sanjay and Craig, Pig Goat Banana Cricket, and The Brothers Flub
- Toon Zone Wrestling (Massive Multiplayer Crossover between many media franchises, in the form of a wrestling league)
- The Tooniverse Emissary (Massive Multiplayer Crossover between a lot of cartoon and anime series, in the same vein as The Subspace Emissary)
- TMDDF: What If? (Danny Phantom-centric Massive multiplayer crossover)
- TMNT Worlds Rise (Teenage Mutant Ninja Turtles (2012), Rise of the Teenage Mutant Ninja Turtles)
- Toonville (Total Drama, Regular Show)
- Top Dog (Massive Multiplayer Crossover. Main continuities: Naruto, Harry Potter, Ranma ½)
- Top Hats and Tigers (Calvin and Hobbes, Professor Layton)
- Topple Your Kings (Code Geass, High School D×D)
- Total Danganronpa (Danganronpa, Total Drama)
- Total Drama Equestria (Total Drama, My Little Pony: Friendship Is Magic)
- Total Drama Island by Gilbert and Sullivan (Total Drama, the Gilbert and Sullivan series of light operas)
- Total Drama Raptured (Total Drama, BioShock)
- Totally Stoppable(Kim Possible, Totally Spies!)
- The Totally Amazing Spider-Man (Totally Spies!, Spider-Man)
- Touken Danshi and The Order Of The Phoenix (Harry Potter, Touken Ranbu)
- Tournament of Kikai (Tournament styled Massive Multiplayer Crossover)
- To Infinity (Halo, BIONICLE)
- To Inherit the Future (Mass Effect, NieR: Automata)
- Tower Of Adamant (Worm, The Dresden Files)
- Trade Winds (Temeraire, Assassin's Creed)
- Transcendence (Bleach, World of Warcraft)
- Transformation Of Ever After High (Ever After High, Transformers)
- Transformers Alter Verse (Transformers: Generation 1, Transformers)
- Transformers Babies (Transformers: Generation 1, Muppet Babies (1984))
- Transformers Frontier (Transformers, Macross Frontier)
- Transformers: MHA (My Hero Academia, Transformers)
- Transformers RWBY: The Flames Of Redemption (Transformers: Prime, RWBY)
- Transposition F (RWBY, Dragon Ball)
- Transposition, or: Ship Happens (Worm, Arpeggio of Blue Steel)
- Trapped in Toon Land (Looney Tunes, Tiny Toon Adventures, Animaniacs)
- A Triangle in the Stars (Gravity Falls, Steven Universe)
- The Triangle of Trolberg (Gravity Falls, Hilda)
- A Trilogy Without Save Files to Abuse (Worm, The Elder Scrolls)
- Triumph of the Retart (Daria, Beavis and Butt-Head, King of the Hill)
- Trollhunters: The Phantom Trollhunter (Danny Phantom, Trollhunters)
- Trololo (Battletech with some Massive Multiplayer Crossover elements, mainly Heavy Gear)
- Trust Doesn't Rust (Supernatural, Jennifer's Body)
- Truth and Revelations (Harry Potter, Stargate SG-1)
- The Truth Behind The Lie (Doctor Who, The Neverending Story)
- The Truth Decays (Naruto, Fullmetal Alchemist)
- The Turn of Haruhi Suzumiya (Haruhi Suzumiya, Umineko: When They Cry)
- The Web Tech (Spider-Man, Glitch Techs)
- Turn of the Tides (Inheritance Cycle, Halo)
- Twenty Years Late (Half-Life, XCOM: Enemy Unknown)
- Twice Chosen (The Hunger Games, Power Rangers (2017))
- Twilight Storm (Doctor Who, The Twilight Saga)
- Two earths (Marvel Cinematic Universe, Arrowverse)
- Twisted Reflections (Dark Souls, The Familiar of Zero)
- Two Kinds (Danny Phantom, Miraculous Ladybug)
- Tyrant Kings (Jurassic Park,, Mass Effect)
U
- The Ultimate Big Brother (Danganronpa, One Piece)
- Ultimate Crossover Wrestling (wrestling Massive Multiplayer Crossover)
- Ultimate Fairy (Ben 10, Fairy Tail)
- ULTIMATE-ONE-TYPE-Taylor (Worm, Fate/Grand Order)
- Ultimate Re-Imaginings (Massive Multiplayer Crossover)
- Ultimate Video Rumble (Fighting Game Massive Multiplayer Crossover)
- Ultrasonic (Miraculous Ladybug, Zootopia)
- The Underside of Gotham (Worm, Batman)
- Undocumented Features (Massive Multiplayer Crossover)
- Unequally Rational and Emotional (Negima! Magister Negi Magi, Sayonara, Zetsubou-Sensei, My-HiME, Batman, others)
- Unexpected Encounters (Massive Multiplayer Crossover with Aggretsuko, and Sonic X with some cameos from characters from other sagas such as Beastars, Star Fox, Kaiketsu Zorori, Happy Tree Friends, and Ratchet & Clank)
- An Unexpected Future (My Hero Academia, The Umbrella Academy (2019))
- Unfamiliar ([PROTOTYPE], The Familiar of Zero) (Yes, seriously)
- Une Monde Plein De Danger (Massive Multiplayer Crossover)
- The Unicorn At Hogwarts (Harry Potter, My Little Pony: Friendship Is Magic)
- United We Stand (Halo, Mass Effect)
- Unity (Inside Out, Big Hero 6, Home, The Incredibles, Despicable Me, Monsters vs. Aliens)
- Unity Force (Girls' Last Tour, Shoujo Kageki Revue Starlight, One Piece, and more and more...)
- The Unity Saga (Star Trek, Star Wars)
- Universetale (Steven Universe, Undertale)
- Universe Falls (Steven Universe, Gravity Falls)
- The Universiad (Massive Multiplayer Crossover)
- Unlimited Potential (Worm, Mega Man)
- Unlife Is Strange: (Life Is Strange, Vampyr (2018), Until Dawn and Control)
- The Unusual Avengers Legacy Protocol (Massive Multiplayer Crossover)
- The Unofficial MK Vs SF Saga (Street Fighter, Mortal Kombat)
- Uzumaki Harry (Naruto, Harry Potter)
V
- Vampire Lovers (Descendants, The X-Files)
- The Vampire of Steel (Buffy the Vampire Slayer, Supergirl)
- Vanishing Act (JoJo's Bizarre Adventure, Persona 5)
- Variant Strain ([PROTOTYPE], Spider-Man Fusion Fic)
- The Vasto of White (Bleach, Fate/stay night)
- Video Game Wars (Massive Multiplayer Crossover Reality Show)
- Vigil (Mass Effect, XCOM: Enemy Unknown, Eclipse Phase, FEAR, and Destiny)
- Villains of Circumstance (Mob Psycho 100, My Hero Academia)
- Viper, Spider, Phoenix (Elementary, Kill Bill)
- Violence in the Library (Star Wars, Alien)
- Voyages of the Wild Sea Horse (Ranma ½, One Piece)
- Vulcan’s Forge (Star Trek, Worm)
W
- Waifs And Strays (The core series are Buffy the Vampire Slayer, Stargate SG-1 and Harry Potter, with characters from Charmed, The Mummy Trilogy, Highlander, M*A*S*H and many, many more.)
- Wail Of The Banshee (Worm, Warframe)
- Waiting In Sin (Bleach, Harry Potter)
- Waking Nightmares (My Little Pony: Friendship Is Magic, Team Fortress 2)
- Waluigi's Taco Stand (Super Mario Bros., The Flintstones, LazyTown, Love Live!, The Nutshack, and other works related to SiIvaGunner memes)
- Wandering of a Sword Hero (Fate/stay night, The Rising of the Shield Hero)
- Wander over Foster's AU One-Shot (Wander over Yonder, Foster's Home for Imaginary Friends)
- A Wand for Skitter (Worm, Harry Potter)
- A wand for Steven (Harry Potter, Steven Universe)
- Warhammer 40000 Trouble (Warhammer 40,000, To Love Ru)
- The Wario Barker Collection (Azumanga Daioh, Doctor Who)
- Warning Letter (Persona 5, Death Note)
- The War to End All Wars (Naruto, BlazBlue)
- Water Aerobics for the Aquaphobic (Harry Potter, Ranma ½, with cameos from Tomb Raider)
- A Waterbending Quirk (Avatar: The Last Airbender, My Hero Academia)
- Watch Dogs: SIN-surrection (My Youth Romantic Comedy Is Wrong, as I Expected, Shimoneta, Watch_Dogs, Durarara!!, Danganronpa and Ajin)
- Wayward Wolf (The Witcher, A Song of Ice and Fire)
- We Are Nothing (Harry Potter, A Nightmare on Elm Street)
- The Weaver Option (Worm, Warhammer 40,000)
- The Wedding (Gravity Falls, A Series of Unfortunate Events, Making Fiends'')
- The Grand Reopening (Gravity Falls, A Series of Unfortunate Events, Making Fiends, Mr. Peabody & Sherman) (Sequel/prequel to The Wedding)
- Welcome to Bugaria (Amphibia, Bug Fables)
- Welcome to Silent Hill (Sherlock, Silent Hill)
- We Make Our Own Light (Dark Souls, Elden Ring)
- Westboro in Equestria (My Little Pony: Friendship Is Magic, The Wizard of Oz)
- The Westerosi (A Song of Ice and Fire, Star Trek)
- What the Cat Dragged In (Miraculous Ladybug, Marvel Cinematic Universe)
- What would have happened if Goku fell into the world of Shuumatsu no Valkyrie (Dragon Ball Super, Record of Ragnarok)
- When a Ghost Meets the Rock Star's Daughter (Danny Phantom, My Dad the Rock Star)
- When Hailey Met Gretel (Hailey's On It!, Hamster & Gretel)
- When the Doctor Went to Downton (Downton Abbey, Doctor Who)
- When In Doubt, Blame the Eldar (Warhammer 40,000, Planetary Annihilation)
- When Is Jade Not Jade (Quantum Leap, Victorious)
- When Legends meet (Primarily a crossover between Tolkien's Legendarium, Marvel Cinematic Universe, Star Wars, Buffyverse, Smallville, Supernatural, Arrowverse, and many others)
- When Life Gives You Lemons (Worm/Portal) (Worm, Portal, mention of Half-Life)
- When the Princess Met the Viking (How to Train Your Dragon, Brave)
- When There Was a Tomorrow (Halo, Mass Effect)
- Guilty Sparks (sequel to above)
- Remnants (sequel to Guilty Sparks)
- When Worlds Collide (Mario, Sonic, & Mega Man Crossover) (Super Mario Bros., Sonic the Hedgehog, Mega Man (Classic))
- When Worlds Collide Series (Darkwing Duck, Danny Phantom)
- When Worlds Collide (Total Drama, The Life and Times of Juniper Lee, 6teen, Family Guy, The Simpsons, Danny Phantom, Courage the Cowardly Dog, Kim Possible, Invader Zim, The Grim Adventures of Billy & Mandy, Samurai Jack, South Park, Ed, Edd n Eddy)
- When the Cold Wind is a Callin' (Brave, How to Train Your Dragon, Rise of the Guardians)
- Where No Pony Has Gone Before (My Little Pony: Friendship Is Magic, Star Trek: The Original Series)
- Where on Earth, Spies (Where's Waldo, Carmen Sandiego, advertising mascots like Erin Esurance and Mayhem)
- Where the Sunlight Ends (Spider-Man Trilogy, The Amazing Spider-Man Series, and Spider-Man: Homecoming Trilogy)
- Where We Don't Belong (Xenoblade Chronicles 3, Xenoblade Chronicles 1, Xenoblade Chronicles 2)
- Whirlpool (Naruto, Worm)
- White Devil of the Moon (Sailor Moon, Lyrical Nanoha)
- The White Wolf of Westeros (The Witcher, Game of Thrones)
- Wick Island (John Wick, She-Ra and the Princesses of Power)
- Wild About Words (Wild Kratts, WordGirl)
- The Wild Horse Thesis (Neon Genesis Evangelion, Ranma ½)
- Winter Troupe Digital Adventure (A3, Digimon)
- Wish (Invader Zim, The Fairly OddParents!)
- Witchblade Sakura (Naruto, Witchblade)
- With Grace And Elegance (Ranma ½, Girls und Panzer)
- With Pearl and Ruby Glowing (Massive Multiplayer Crossover)
- The Winx Club Loops (Winx Club, The Infinite Loops)
- The Wizard and the Lonely Princess (Harry Potter, My Little Pony: Friendship Is Magic)
- The Wizard in the Shadows (The Lord of the Rings, Harry Potter)
- Wolverines, Wendigos and Winchesters (X-Men Film Series, Supernatural)
- Wolves That Walk Alone (RWBY, Halo)
- Wonderful (Mazinja) (Worm, The Wonderful 101)
- The Wonder Saturdays (crossover with Wonder Woman and The Secret Saturdays)
- A World of Bloody Evolution (Warhammer 40,000, RWBY)
- The World According To Peter Parker And Karen Starr (Spider-Man, The DCU)
- The World of the Creatures (Avatar, Primeval, Batman, Buffy the Vampire Slayer, Doctor Who, Tetrapod Zoology, King Kong, Jurassic Park, Predator, Alien, Planet of the Apes)
- Worldwar: Discovering the Balance (Worldwar, Stargate, Battlestar Galactica (2003))
- World of Ponycraft (My Little Pony: Friendship Is Magic, World of Warcraft)
- Worlds Collide (TMNT) (Teenage Mutant Ninja Turtles (2003), Teenage Mutant Ninja Turtles (2003))
- World Without Logos, (Hellsing, Seraph of the End)
- Worm Grand Order (Worm, Fate/Grand Order)
- Worm-in-Waiting (Worm, Warframe)
- Worm - Justice For All (Worm, Infinite Dendrogram)
- Worm: More Than Meets the Eye (Worm, Transformers)
- Would That I Were Born No Princess (Final Fantasy Tactics, The Saga of Tanya the Evil)
- Wyvern Queen (A Song of Ice and Fire, Fire Emblem: Three Houses)
X
Y
- Yoshi Kart (Massive Multiplayer Crossover)
- A Young Girl's Game of Thrones (A Song of Ice and Fire, The Saga of Tanya the Evil)
- A Young Girl's Guerrilla War (Code Geass, The Saga of Tanya the Evil)
- A Young Girl's Weaponization of the Mythos (Cthulhu Mythos, The Saga of Tanya the Evil)
- Young Wolf (RWBY, God of War (PS4))
- A Young Woman's Inevitable Dance of The Dragons (A Song of Ice and Fire, The Saga of Tanya the Evil)
- You're the Hero of Light, Charlie Brown (Massive Multiplayer Crossover)
- Yu-Gi-Oh! 5Ds A Live (Live A Live and Yu-Gi-Oh! 5Ds)
- Yugioh EQG (Yu-Gi-Oh! ARC-V, My Little Pony: Equestria Girls)
- Yu-Gi-Oh! Extra CCC: Path to the King (Yu-Gi-Oh! GX, Fate/EXTRA)
- Yu-Gi-Oh! The Thousand Year Door (Yu-Gi-Oh!, Paper Mario: The Thousand-Year Door)
- YuYuGiDigiMoon (YuYu Hakusho, Yu-Gi-Oh!, Digimon, Sailor Moon)
Z