I forgot there are so any Aus so I'll narrow it down to some Aus that can be ask or dareUndertale
Underfell
Underswap
Swapfell
Outertale
Echotale
Inktale
Errortale + core frisk
Dusttale
Horrortale
Underfresh
ReapertaleIf you Have an AU that's Not here and think should be here let me know in the comments.

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Ask or dare undertale Au's (COMPLETE)
Randomships sans X frisk papyrus x Mettaton Undyne x Alphys Toriel x Asgore Asriel x Chara you can also ask Flowey, Nastablook, Temmie And myself if you want