Differentopic is the crossover Undertale AU that popularized mixing and matching characters from various franchises into seemingly nonsensical roles, along with being the first known to do so.
Its content and roles have changed sporadically in its 4 years of ongoing development.
- Frisk's role is taken by Sonic from Sonic the Hedgehog.
- Flowey's role is taken by a Evetz (Original zombie character) from Minecraft.
- Toriel's role is taken by Cappy from Super Mario Odyssey.
- Sans's role is taken by Pink Sheep from ExplodingTNT's videos.
- Papyrus's role is taken by Purple Shep from ExplodingTNT's videos.
- Undyne's role is taken by a Rai Luchador (Original Raichu character) from Pokémon.
- Alphys's role is taken by a PH.D Pikachu [Nicknamed as Smartiechu] (Original Pikachu character) from Pokémon.
- Mettaton's role is taken by a Spyro from Spyro The Dragon.
- Asgore Dreemurr's role is taken by Ganondorf from The Legend of Zelda.
- Asriel Dreemurr's role is taken by Steve from Minecraft.
- Chara's role is taken by Sonic.exe, a Sonic the Hedgehog creepypasta.
- Bronzor/Bronzong from Pokemon has an original role
- Napstablook's role is taken by Banjo from Banjo-Kazooie.
- Bowser from Super Mario has an original role.
- Annoying Dog's role is taken by Gonzo (Original character) and Goose from Untitled Goose Game
- Grillby's role is taken by Johnny Bravo from Johnny Bravo.
- Mega man from Megaman has an original role.
- Mad Dummy's role is taken by Wario from WarioWare.
- Bowser Jr. from Super Mario has an original role
- Rayman from Rayman has an original role.
- Muffet's role is taken by Kaptain K. Rool from Donkey Kong Country 2: Diddy’s Kong Quest.
- Glyde's role is taken by Yaridovich from Super Mario RPG: Legend Of The Seven Stars
- So Sorry's role is taken by Rick and Morty from Rick and Morty
- Mad Mew Mew's role is taken by DIO from JoJo’s Bizarre Adventure.
- Gaster's role is taken by Dr. Eggman/Ivo Robotnik from Sonic The Hedgehog.
Human Souls (Chaos Emeralds)
All of these characters come from the Sonic The Hedgehog franchise:
- Patience = Mighty The Armadillo
- Bravery = Knuckles The Echidna
- Integrity = Amy Rose
- Perseverance = Miles “Tails” Prower
- Kindness = Ray The Flying Squirrel
- Justice = Fang The Sniper/Weasel
- The Ruins are replaced by Abandoned Mineshaft (Minecraft)
- The Ruins City are replaced by Bonneton (Super Mario Odyssey)
- Snowdin is replaced by Tundra Village (Minecraft)
- Grillby's is replaced by Bravo's "Bodybuilding" (Original)
- Waterfall is replaced by Cerulean Cave (Pokémon)
- Temmie Village is replaced by OC Town (Original)
- There is an original area called Dream Land (Kirby)
- Hotland is replaced by Lava Reef Zone (Sonic The Hedgehog)
- MTT Resort is replaced by Pokéstar Cinema (Pokémon Black and White 2) and The Krusty Krab (Spongebob Squarepants)
- The CORE is replaced by Death Egg (Sonic The Hedgehog)
- New Home is replaced by Ganondorf’s Castle (The Legend of Zelda: Ocarina of Time)
- The True Lab is replaced by Glitch City (Pokémon)
- Differentopic became a MegaloSans AU as Execution became more popular than the AU itself.
- ↑ New Undertale AU: Differentopic - DeviantArt (March 15 2019 archive)
- ↑ Differentopic is now MegaloSans - SoundCloud (dead link)