I tend to like the really quiet ones who rarely show emotion but when they do it's d'awww enducing (Rei Ayanami, Sakaki, Yuki Nagato, etc...)
I also really like the women in anime who are kind of tough and experienced in life, kind of snarky and cocky, know how to beat the shit out of you, like to drink but still somehow very wise and sophisticated through it all (Misato Katsuragi, Kitsune, etc)
As for guy anime character traits I like...their arent many anime guys I do like sadly cause most of them are wussy and really boring but I kind of like the powerful characters who can keep themselves contained and keep cool under pressure. Cockiness is also welcomed for anime guys, I love smirking anime dudes. (Kaji from Eva, Kamina, Youji and Natsuo from Loveless)
How can you not love the evil smile? ahhhhh