I don't read that many fics (mostly because I'm very picky, and also 'cause I wanna avoid accidentally making something similar) so I hope it's okay if I extend this answer to reading in general, fics and books!!

Fav tropes/things:
- FANTASY, especially modern fantasy!
- "and they were roommates"
- childhood friends to lovers
- rivals to lovers
- mutual pining
- angst with happy ending
- enemies to lovers (esp if they HAVE to cooperate because theyre stuck together ghekjg)
- secret identities (superheroes for example)
- college AU
- puppy top / dominant bottom
- reincarnation
- ghosts (???) (i just love horror movies)
- GAMING AUs HZJKH and streamer AU
- hetbend and genderbend
- when theyre stuck together bc of a storm
- ROYAL AU
- age gaps

honorable mentions:
- idol AU
- fake dating

Least fav:
- love triangles (unless they end in polyamory)
- dead dove in general (my only dead dovey taste is another ship, and it's problematic by default of existing LOL)
- babytrapping
- corrective assault among the main ship
- anything that compares the skin color of kaeya to chocolate or sth, it just makes me shudder
- orientalist tropes (aladdin aus, bellydancing done incorrectly, etc); (it's a very fine line to walk and more often than not it's midly offensive)