UnderRoleChange is my idea of a Switch Up AU. You may comment your ideas for possible role changes, and new characters. I will read the comments, so don't feel like you'll be ignored. Please enjoy my AU.
Garry (the soul of Kindness) takes the Protagonist role.
Robert (the soul of Justice) takes the First Fallen Child role.
The Caverns' Monsters
Papyrus takes the Soulless Being role.
Alphys takes the Caretaker role.
Ghrostly (a ghost) takes the Crying Ghost role.
Asriel takes the Pun Teller role.
Flowey takes the Guard-Wannabe role.
Temove replaces Doggo.
Smaller Tem replaces Lesser Dog.
Dogamy and Dogaressa are replaced by Temriodas and Temriad, names based off Welsh words.
Larger Tem replaces Greater Dog.
Asgore takes the Royal Guard Head role.
Monster Bro is the new Monster Kid.
The Mad Dummy has possessed a sword and shield, making the Angry Weapons.
The Dogs take the Villager role.
Toby Fox takes the Odd Villager Out role, and fights you in the Genocide Post-game (if you wanna make it, I'm no developer).
Toriel is the Royal Scientist.
Robert, a member of Dog Village, takes the Celebrity role as RoBob.
Undyne takes the Queen role.
EXTREME Papyrus takes the place of OMEGA Flowey, but E-Paps isn't quite as... terrifying... and COMPLETELY RIDICULOUS!!!
Sans takes Asriel's role, and is friends with the King and Queen.
JacKEP the Kinda Emerald Pickaxe is a bonus character, in any run's Post-game (again, feel free to make the game).
Gaster has been replaced with Dr Resolu Sean.
UnderRoleChange has no real songs made, but the ideas exist.
Garry's Music: A long time ago, Menu Screen
Papyrus: Your Coolest Friend, You know what's up human, Your Coolest Nightmare
Alphys: Took a Fall, Soulpain
Asriel: asriel, It's Pouring Down Elsewhere, Vengeance
Flowey: Yehehehe, Pellettrousle
Asgore: Escape!, NRAHH!, Trident of Perseverance, Fighting True Determination
Toriel: Toriel's Lab
RoBob: Time for the TV, Iron Stomper, Defeat from Coolness, Strength of -BRILLIANCE-
Undyne: Die Aquatische Königin, UNDYNE
Sans: Reminder, Bones and Skulls, Save the Universe, His Song