Psychological and tragedy. For whatever weird reason, I get off on sadness and suffering. There are these certain mangas that stick with me because of their "sad" endings. Believers, Homunculus, Himizu, so on. Mangas you have NEVER heard of really. I have a fascination with suffering and so there is something I really like about tragedy. To be honest, what really seems to attract me are 'dark' stories with some really twisted element like ... fuck I can't say it... it's so bad. Well morally messed up elements.
Sssshhhh, don't hate me
Also, some romances are nice but it really depends.