Heya. Right now I'm into Undertale, so I'm gonna channel that into creativity. Now I have multiple Undertale Aus. I'm going to include them here so you have stuff to look out for
Undertale: Strike First - Premise is that it takes place 5 years after a specific neutral route in the original game.
NB!Underswap - It's like TS!Underswap but instead of the roles being switched, it's the personalities of characters.
Dusttale: Double The Fun - Takes place after resets from both Dusttale and Dustbelief. Sans and Papyrus remember everything pre-reset, and team up to gain EXP to defeat the human.
Undertable - Joke AU. The characters are planned to have exaggerated features and exaggerated personalities that are a satire of the fandom.