Mine is delinquents and bad/morally grey characters turning good (I wasn't aware of that but all my favorite characters are like that: Inupi from tr, Choso from jjk)
For romance, I would say that I like when both the MC and love interest have problems, but they fix each other
And for action, I also think that troupe of bad characters turning good, too. reply
Enemies to lovers. I only like it when both sides are strong af though. Thriller Trainee and This Damned Thirst for Survival are perfect examples (novels). From manhua I would say Global Examination, but MC and ML don’t really hate each other in the beginning reply