This is something similar I did with Ben's au themes, it just doesn't have all of them cause I lost motivation half way through and I didn't know what to put for some of them but I didn't want the ones I did go to waste so here we go!

Undertale:

Underswap:

Underfell:

Outertale:

Underfresh:

Dancetale:

Horrortale:

Trainertale:

Fantasytale:

Inktale:

Underkeep:

Nightmaretale:

Undertone: