Mine are a bit Xianxia-specific, since that's mostly what I've been reading in recent years.
Least favorite tropes:
1) Evil has no consequences, but good acts will always be punished.
2) The world is dark and cruel to the point of absurdity and impossibility.
3) MC is the least important person in the world who nobody should ever care about, but is still always the target of everyone's attention.
4) Everything always happens at the last possible second.
5) Every woman MC meets falls in love with MC instantly, but the women all somehow managed to remain virgins for up to millions of years before they met MC.
Only five, really? But I hate so much more!
Favorite tropes:
1) MC is a genius who makes all other characters look like idiots.
2) MC is born in the boonies where the highest cultivation level is Body Refining Tier 3, but slowly climbs their way up to the part of the world where people actually know how cultivation works.
3) MC has a cute animal companion that grows alongside them.
4) MC finds/inherits a random god-tier item that helps them on their cultivation journey. Bonus points if the item also has an artifact spirit/grandpa's soul/etc.
5) MC's best friend at the start is an extremely fat guy named Fatty [x].