Design Favorites:
Heavy bangs, much like this or this. Round glasses are a huge favorite as well, and I have to resist giving my OCs that a lot.
Characterization favorites:
(Also see Rico for this one.)
Genre Favorites:
Historical fiction, especially anything set in the mid-to-late 20th century! Bonus if they're furries with cool worldbuilding. This is why I love Blacksad so much 'cause it hits all of those points for me. Yes, I am absolutely promoting Blacksad again, it's that good. I also like things set in the modern day, though not as much.
Design Dislikes:
I'm not particularly picky when it comes to this, but I'm not a fan of overly complex designs. And anything relating to dragons. Never was a fan of those. I HATE object heads.
Characterization Dislikes:
I'm not particularly picky when it comes to this either. However, I'm not a fan of most religious-centric characters, with a few exceptions. I also don't like demons; I just don't think they're that interesting. I also hate German WWII OCs. 99 times out of 100 they're never done well.
Genre Dislikes:
ANYTHING fantasy related. I can't stand the genre as a whole, it just makes me fucking cringe. I could go on all day about how much I hate the entire genre fantasy, and its subgenres, but that will make me look like a complete tool and asshole, so I won't. I also don't like pirates or vampires, shit like that. I also HATE the superhero genre as a whole. The Boys is once again, an exception, because I think it's the only good take on how superheroes would work in the real world. I'm also not fond of most anime.
Please note that these dislikes are not an end-all-be-all. If it's good enough for my tastes, I will probably overlook the fact that it falls into something I normally don't like.