Fanfics that are crossovers between works across one or more types of media.
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Q
- Queen of Blood (Worm, Castlevania)
- Queen of the Moon (Sailor Moon, Overlord)
- Queen of Nothing (Worm, Dark Souls, Bloodborne, Elden Ring)
- 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 Quest For The Keys Of Death (Percy Jackson and the Olympians, The Owl House)
- 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 (2011), and others)
- Quoth the Raven (Naruto, Tolkien's 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)
- Raise Your Voice Against Liars (Miraculous Ladybug, Persona 5)
- Ranma Club (Ranma ½, WinxVerse)
- Rap Battles (Massive Multiplayer Crossover)
- Raphie's Revenge (One Piece, Furby)
- 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)
- Reality Intrudes (Worm, The Matrix)
- 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)
- Re:Azure (BlazBlue, Re:Zero)
- Rebel King (XCOM 2, Star Wars Rebels)
- Reborn (Kung Fu Panda, The Crow (1994))
- Reborn With Quirks (Akame ga Kill!, My Hero Academia)
- 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)
- Re degli Harem (High School D×D, Campione!)
- Red like Blood (Hellsing, RWBY)
- Red Like Stardust (JoJo's Bizarre Adventure, RWBY)
- The Red Meeting (Star Wars, Animorphs)
- Red Pride (Smallville, Charmed (1998))
- 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)
- Redemption (Doom, Hazbin Hotel)
- The Reflect Series (Ben 10 ,Young Justice)
- Reflections Lost on a Dark Road (Ranma ½, Teen Titans (2003), X-COM)
- Re-Life as a Busty Devil (Naruto, High School D×D'')
- The Reluctant Beautiful Dreamer (Sailor Moon, The Transformers)
- Remnants Beast Wars (RWBY, Beast Wars)
- The Remaining Sense of Pain (The Garden of Sinners, Worm)
- Remnant and Runeterra: A Tale of Two Worlds (RWBY, League of Legends)
- Remnant Inferis: DOOM (RWBY, Doom (2016))
- Remnant's Mightiest Heroes (RWBY, Marvel Universe)
- Remnant (Moonview) (Young Justice (2010), Five Nights at Freddy's)
- Remnant of a Worm (RWBY, Worm)
- Remnants of Causality (Muv-Luv, RWBY)
- Remnants of Fate (Fate/stay night, RWBY)
- Renegade (Mass Effect, Command & Conquer: Tiberian Series)
- Renamon Who? (Digimon Tamers, Jackie Chan Adventures)
- Re; Naruto - Plus Ultra! (Naruto, My Hero Academia)
- The renegade hero!!!....Invader Zim? (Invader Zim, Atomic Betty, Lilo & Stitch)
- The Requiem of Remnant (JoJo's Bizarre Adventure, RWBY)
- La Resistance (Animaniacs, Looney Tunes, Who Framed Roger Rabbit, Tiny Toon Adventures)
- Respect (Smile Pretty Cure!, Puella Magi Madoka Magica)
- Restaurant To Another World: New Stories (Restaurant to Another World, Persona 5)
- Resurgence Series (The Twilight Saga, Heroes (2006))
- 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 Of A King - Redux (My Hero Academia, Demon Slayer: Kimetsu no Yaiba)
- 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, 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)
- The Rigel Black Chronicles (Song of the Lioness, Harry Potter)
- Ring-Maker (Worm, The Lord of the Rings)
- The Rippleverse (Massive Multiplayer Crossover)
- Rise of the Brave Tangled Dragons (Tangled, Brave, How to Train Your Dragon, Rise of the Guardians and more)
- Rise of the Dragon Child (Harry Potter, The Elder Scrolls V: Skyrim)
- Rise of the Galeforces (The Incredibles, Portal, Jurassic Park, Megamind, Donkey Kong Country, and a lot of honorable mentions)
- Rise of the Shadow Hero (My Hero Academia, Solo Leveling)
- 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 Dragon (Naruto, Street Fighter)
- 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)
- The Road to Hell (Code Geass, Worm)
- 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)
- Rose Brood (RWBY, StarCraft)
- The Rose of Digital World (The Rose of Versailles, Digimon)
- The Rose's Ocean (RWBY, One Piece)
- A Rose's Scales (RWBY, Inheritance Cycle)
- Roses and Ladybugs (Samurai Jack, Steven Universe)
- The Royal Protector (Frozen, Tangled)
- The Royal Twins of Hell (Gravity Falls, Hazbin Hotel)
- Roze from Remnant (Kamen Rider Zi-O, RWBY)
- The Ruinous Princess (High School D×D, Worm)
- RunawayRonpa (The Runaway Guys, featuring plot ideas and concept of Danganronpa)
- Running with Death (Harry Potter, The Addams Family)
- RWBY Academia (My Hero Academia, RWBY)
- 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 Hearts: The Journey (RWBY, Kingdom Hearts II)
- RWBY - War of the Ring (RWBY, The Lord of the Rings)
- RWBY Zero (Fate/stay night, RWBY)
- Ryuko's Bizarre Adventure: Deadly Academia (Kill la Kill, JoJo's Bizarre Adventure)
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)
- Saiyan Effect (Dragon Ball, Mass Effect)
- Sagittarius (Destiny, Inheritance Cycle, Transformers, Monster Hunter, Warhammer 40,000)
- Stargazer (Keltoi) (Destiny, Inheritance Cycle)
- No stars in sight (rewrite of Stargazer)
- Seeker (Keltoi) (Destiny, Transformers)
- Stargazer (Keltoi) (Destiny, Inheritance Cycle)
- Saiyan in Brockton (Dragon Ball, Worm)
- A Salaryman in Nobuna's Court (Kamen Rider, The Ambition of Oda Nobuna)
- A Samurai In Hell (Hellaverse, Samurai Jack)
- Samus Aran: The Spectacular Spider-Mom (Metroid, Marvel Cinematic Universe)
- Sanguine Serenity (Bleach, Jujutsu Kaisen)
- SAO - A New Matrix (The Matrix, Sword Art Online)
- 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)
- Savior or Slayer (Slay the Princess, My Hero Academia)
- The Saviour and the Slayer (Buffy the Vampire Slayer, Once Upon a Time (2011))
- Say It Thrice (Danny Phantom, Beetlejuice)
- The Scarab (Buffy the Vampire Slayer, Stargate SG-1)
- Scathach (Harry Potter, The Eminence in Shadow)
- Schnee: Hero or Huntress (RWBY, My Hero Academia)
- Schnee's Bay (RWBY, Worm)
- School Idol Days (Love Live!, School Days)
- Scion of Sorcery (Harry Potter, Doctor Strange (2016))
- Scooby-Doo and the Exorcist Angel (Hazbin Hotel, Scooby-Doo)
- Scott Pilgrim vs. Snow Flower and the Secret Hall Pass (Durarara!!, Hetalia: Axis Powers, Baccano!, Fullmetal Alchemist, Gintama)
- SCP Explored: Playtime Co. (Poppy Playtime, Poppy Playtime)
- Scrambleverse: A Fic for All and None (Homestuck), Massive Multiplayer Crossover
- Scream for Me (The Last Flowerchild) (primarily a crossover between Scream, Friday the 13th, A Nightmare on Elm Street and Halloween with cameos from other horror franchises)
- Screaming Until Dawn (Primarily, Until Dawn and Scream; includes cameos from Life is Strange, The Vampire Diaries and Happy Death Day)
- TEH SCREAMING OF THE LAMBS (The Silence of the Lambs, Arthur, Jurassic Park)
- The Scrybe of Fantasies (Inscryption, The Owl House)
- 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)
- 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)
- Second Chance (Code Geass/Cross Ange) (Code Geass, Cross Ange)
- Second Chance (KantsMoralTheory) (Rambo, The Rising of the Shield Hero)
- A Second Stockpiler (Mob Psycho 100, My Hero Academia)
- 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)
- SEED: Shatter Point (Star Wars, Mobile Suit Gundam SEED)
- 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)
- Senran Kagura: Shinobi Chronicles (Senran Kagura, Kamen Rider)
- 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)
- Seth in the Pokécity (Pokémon, Minecraft)
- 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 Teyvat (Genshin Impact, Jujutsu Kaisen)
- Shadow of Zero (Dungeons & Dragons, The Familiar of Zero)
- 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))
- Shads The Defenderverse:
- Shallow Hilt (Bleach, Fate/stay night)
- Shang-Chi and the American Dragon (crossover with Shang-Chi and American Dragon: Jake Long)
- Shared Secret (Phineas and Ferb, Hamster & Gretel)
- Shattered Blade (Fate/stay night, Sekirei)
- Shattered Fate (My Hero Academia, Marvel Cinematic Universe, Naruto, Ranma ½)
- 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 (2011), Agents of S.H.I.E.L.D.)
- The Shield's Dragon (Yakuza 6, The Rising of the Shield Hero)
- Shine on Me (JoJo's Bizarre Adventure: Diamond is Unbreakable, Sword Art Online)
- 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's Creed (Assassin's Creed, Naruto)
- 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)
- ShyXMHA (SHY, My Hero Academia)
- Siblings of Doom! (The Loud House, Invader Zim)
- Signs Between the Universes (Hazbin Hotel, The Owl House)
- Silence Falls (Worm, Sailor Moon)
- Silent Partner, Unfinished Business (100 Bullets, Death Note)
- Silly but Killy (Warhammer 40,000, Mass Effect)
- Silver (Doctor Who, The Professionals)
- 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)
- The Sin Queen (My Hero Academia, Hellaverse)
- Six (Deadpool, The Legend of Zelda, Harry Potter, Mortal Kombat, Nazi Zombies, My Little Pony: Friendship Is Magic)
- The Skeksis Slayer (The Dark Crystal, Star Wars, The Legend of Korra, The Dragon Prince, High Guardian Spice, The Legend of Zelda)
- Skies of Remnant (Armored Core VI: Fires of Rubicon, RWBY)
- Skitterdoc 2077 (Worm, Cyberpunk 2077)
- A Skittering Heart (Kingdom Hearts, Worm)
- Skool Hooligans (How to Train Your Dragon, Vikingskool)
- Skullgirls Watch Death Battle (DEATH BATTLE!, Skullgirls)
- 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)
- Slumped In Parallel (The Camp Half-Blood Series, High School D×D)
- Sly Cooper: Boiling Blood (Sly Cooper, The Owl House)
- Sly Cooper and the Phantom Masters (Sly Cooper, Persona 5 and Hunter × Hunter)
- SmallvilleX: Evolution (Smallville, X-Men: Evolution)
- Snakepit (Stargate SG-1, The Draka)
- Snic nd the OSrailian resrant (Sonic the Hedgehog, Sonic the restaurant)
- A Snow Queen In NYC (Frozen, Rise of the Teenage Mutant Ninja Turtles)
- Snuggles the Symbiote (Worm, Marvel Universe)
- Solar Winds (Glee, Avatar: The Last Airbender)
- Solara Lovegood and the Shadow of the Dragon (Harry Potter, A Song of Ice and Fire)
- The SOLDIER General's Self-Saving Shizun (The Scum Villain's Self-Saving System: Ren Zha Fanpai Zijiu Xitong, Final Fantasy VII)
- The Solver's Circus (Murder Drones, The Amazing Digital Circus)
- 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)
- Songbird (Njistar) (KPop Demon Hunters, Batman)
- Song of a Northern Sorcerer (A Song of Ice and Fire, Star Wars: The Old Republic)
- A Song of Dragons and Monsters (A Song of Ice and Fire, Monster Hunter)
- A Song of Ice and Fire Cut Short by Dust (RWBY, A Song of Ice and Fire)
- 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 Hearts (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)
- A Song of Silk and Saplings (Bug Fables, Hollow Knight)
- Son Of The Hood (Danny Phantom, Comic Book/Batman)
- Son of the Seven Kingdoms (A Song of Ice and Fire, The Elder Scrolls)
- A Song of Moon and Gold (Elden Ring, A Song of Ice and Fire)
- 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)
- Sonic the Sparrowhog Series (Sonic the Hedgehog, Disney Fairies)
- 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 of Light (Magic: The Gathering, The Owl House)
- Spark to Spark, Dust to Dust (RWBY, Transformers)
- A Spartan in Westeros (Game of Thrones, Halo)
- SPdr: Peni and Jimmy's Adventures. (Spider-Man: Into the Spider-Verse, Jimmy Neutron: Boy Genius)
- Special (Glee, Marvel Universe)
- A Special Kind of Magic (The Rising of the Shield Hero, Marvel Cinematic Universe)
- A Special Prescription (V (2009), Doctor Who)
- Spectacular Reality (Spider-Man, My Hero Academia)
- Spectacular Spider Hero Girls (The Spectacular Spider-Man, DC Super Hero Girls (2019))
- Spider-Gwen and the Super Hero Girls (Spider-Gwen, DC Super Hero Girls (2019))
- 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 (Spider-Man, Teenage Mutant Ninja Turtles)
- Spider of Super Hero High (Spider-Man, DC Super Hero Girls)
- Spiders and Magic: Rise of Spider-Mane (Spider-Man, My Little Pony: Friendship Is Magic)
- Spider, Slayer, Vampires and Avengers (Buffy the Vampire Slayer, Marvel Cinematic Universe)
- The Spider Spirit (The Legend of Korra, Spider-Man)
- Spidey vs. the Forces of Evil (Spider-Man, Star vs. the Forces of Evil)
- Spider-X & sequels (Spider-Man, X-Men: Evolution)
- Spinel's New Best Friend (Steven Universe, My Little Pony: Friendship Is Magic)
- The Spy Who Came to Kirkwall (Burn Notice, Dragon Age)
- Spy X Son (SPY×FAMILY, Dragon Ball Super)
- 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)
- Stargate: Guardians (Sailor Moon, Stargate SG-1)
- Stars of the Midnight Range (Fallout, Oshi no Ko, Kaguya-sama: Love is War, Like a Dragon)
- A Starstruck, Phantasmic Romance (Danny Phantom, Teen Titans (2003))
- Star Wars A New Dawn (Star Wars, Final Fantasy XIV)
- 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: The Hellwalker Saga (Star Wars, Doom)
- Star Wars: The Light of Hope (Star Wars, Zone of the Enders)
- Star Wars: Twilight of the Force (Star Wars, My Little Pony: Friendship Is Magic)
- Star Wars vs Warhammer 40K (Star Wars, Warhammer 40K)
- Star-Crossed (Star Wars, Star Trek)
- Stardust (My Little Pony: Friendship Is Magic, XCOM: Enemy Unknown)
- Star Fall (Octopath Traveler, Octopath Traveler II)
- 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)
- Stargate: Spartan Siege (Stargate SG-1, Halo)
- Starlight Series (Starlight, Aftermath [Lilo & Stitch, Star Trek], A Trip to Japan [Lilo & Stitch, Cardcaptor Sakura])
- Starry Eyes (Worm, Cthulhu Mythos)
- Stars Ablaze (Star Trek, Star Wars)
- Stars Above (Lucky Star, Puella Magi Madoka Magica)
- Stars Fade (Mass Effect, Dragon Age)
- The Stars Will Aid Their Escape (My Little Pony: Friendship Is Magic, Cthulhu Mythos)
- Starships Don't Go Indoors! (Mass Effect, R-Type)
- Stay awake in my arms because love is not a game. (Jeff the Killer (2011), Ben Drowned)
- Stealing Dreams (Persona 5, Changeling: The Lost)
- 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)
- Stormfall (Warhammer: Age of Sigmar, Worm)
- Storms Overhead (The Familiar of Zero, inFAMOUS)
- The Storm Spider (Storm Hawks, Spider-Man)
- 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.)
- Story of Sin (Limbus Company, Bakemonogatari)
- Straight Edge (Fate/stay night, Worm)
- The Stranded Barbarian (Conan the Barbarian, Goblin Slayer)
- Strategic Cyborg Evangelion (Neon Genesis Evangelion, Half-Life, Mobile Suit Gundam)
- Strange New Cycles (crossover with Mass Effect, Halo, and Star Trek)
- Strangers From Different Worlds (Marvel Cinematic Universe, Spider-Man Trilogy, X-Men (Film Series), Fantastic Four Duology, Blade Trilogy)
- Stranger Things 3: The Wrath of Michael Myers (Halloween, Stranger Things)
- Stray Cats (High School D×D, The World Ends with You)
- Strawberry meets Sonic the Hedgehog (Sonic the Hedgehog, Strawberry Shortcake's Berry Bitty Adventures)
- Stray Dog Records (Bungo Stray Dogs, Magia Record: Puella Magi Madoka Magica Side Story)
- Strength of an Honest Soul (Darksiders, RWBY)
- Strike a Match (Naruto, Bleach)
- The Strings We Pull (OneShot (2014), Deltarune, OFF, Purrfect Apawcalypse, Night in the Woods, The Hex, Inscryption, The Magnus Archives)
- Struggling to find Happiness (Berserk and The Owl House)
- A Subtle Knife (Worm, Young Justice (2010))
- Sudden Contact (Mass Effect, StarCraft)
- Suicidal Overconfidence (Central Park/Marvel) (Central Park, Marvel Universe)
- A Study In Magic (Sherlock, Harry Potter)
- Summer and Winter: (One Piece, Rise of the Guardians)
- Sunnydale Centurion (Buffy the Vampire Slayer, Doctor Who)
- Sunset Shimmer: Crumple-Horned Snorkack (My Little Pony: Friendship Is Magic, Harry Potter)
- Sun's Valour (Fate/Prototype, Tolkien's Legendarium, Franchise/Riordanverse, High School D×D)
- A Supe of a Man (Superman, The Boys (2019))
- Super Danganronpa Bros. (Danganronpa, Super Mario Bros., The Legend of Zelda: Twilight Princess, Inuyasha, Identity V, Metroid)
- 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)
- Supernatural and Aliens Encore (KPop Demon Hunters, Dandadan)
- 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)
- Super Sentai Alternate (Massive Multiplayer Crossover)
- 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)
- Surrogate of Zero (Neon Genesis Evangelion, The Familiar of Zero)
- Survivability (Bleach, TVXQ, Super Junior, Big Bang, SHINee, B2ST, other K-Pop characters)
- Survivor: Central Hub (Massive Multiplayer Crossover)
- A Survivor Is Born (Worm, Tomb Raider (2013))
- Suzumiya Haruhi No Index (Haruhi Suzumiya, A Certain Magical Index)
- Swapping Genres (Once Upon a Time (2011), 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)
- Symbol of Hope (Superman, Warhammer 40,000)
- The Symbol of Peace and Justice (Dragon Ball Z, My Hero Academia)
- Synesthesia (Worm, The World Ends with You)