Find your tribe in a Sea of Creativity
While I am here, I am going to recommend some good fanfictions from ao3. The incomplete ones have all been updated at least as recently as 2020, I think. Enjoy!
MHA:
Useless monster by MuteCrows (incomplete- 34 chapters)
The entire “For Want of a Nail” series by Clouds (some complete, some not)
Dis(associate) by BeyondTheClouds777 (complete)
The “WE’RE REACHING LEVELS OF FURRY THAT HAVE NEVER BEEN SEEN BEFORE” series by Hayato (all complete but 1, and to clarify the name, they are all animal transformation fics)
Undertale:
Fur a good time call... by popatochisp (complete)
The house next door by Battlemaiden13 (incomplete- 63 chapters)
Our place among the stars by Nascent (incomplete- 32 chapters)
Homestuck:
The “demonstuck” series by Corvid_knight (most are completed oneshots)
The “catacombs” trilogy (specifically vanitas vanitatum, but all 3 are good) by oxfordroulette (complete)
Second best by NoBrandHero (complete)
Stubborn Flocks by 09Pyros_09Hydros (incomplete- 26 chapters)