I hate people, mostly. Not so much ideas.

Anything and everything can be done well, regardless of quantity or popularity.

I don't really know if I fit into 'liking' one particular character over another- I've played a whole slew of them. Hell, the three favorites of mine are all different in their own way. One is tragic, one is an anti-hero and the last one is [s]fucking adorable.[/s] Genres is something else, as I naturally gravitate to high fantasy and some fandoms I'm in.

Naw, the only thing that grinds my gears is people taking shit super personally. Critique an idea of theirs, or their execution, and they get uppity and defensive as if you've insulted their family, regardless of how polite you are about it. I Gm'd an RP once and had to deal with this on, like, three separate occasions. Not fun.

Re-used characters is a personal pet-peeve too, because they're mostly indicative of major self-inserts that lead to the above behaviour. One guy I know is particularly notorious for this.