Undertale character slots:
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Main characters:

Frisk -

Flowey -

Toriel -

Sans/Dust sans - @Sans_TS2

Papyrus- @Merijn2019

Undyne-

Alphys-

Mettaton-

Asgore-

Asriel- @_Lynallopa_

Chara-
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Choose your character wisely you can't change it after you do. and if your also like me who believes in the theory chara and frisk are the same person, whoever chooses them let me know.