Here's the AUs and ask to be one don't be shy!

UnderSwap;

Sans;

Papyrus;

Frisk; Taken

Chara; Taken

Napstablook(napstabot);

Mettaton(Hapstablook);

Flowey;

Temmie;

Undyne;

Alphys;

Toriel(Teacher);

Asgore(Teacher);

Gaster(teacher) ;

Muffet;Well a cooking teach lol)

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Ask for any more au characters