Depends. my first option would be yanderes. Also, I'm not picky with appearance, so as long as I find the person cute it's ok. Strictly saying, they make for great servants, even if you need to act like the only thing in your mind is them. They make for great pawns as well, and are easily controllable. They're also one of the few people that will obey reckless orders like "die for me". That makes them my favorite type of heroine. Considering the fact that I'm a hikkikomori (I work, but it's at home) and I don't enter social contact with anyone besides the supermarket delivery guy, she would have no reason to go crazy and kill those close to me, mostly because there are no people like that.
EDIT:I have a special dislike for Tsunderes. They are aggressive for little to no reason at all, which just makes me want to retaliate 10x times what they did. So if they hit me, I'd feel a sudden urge to kill that person.
This is personal though and I do understand why other people like them.
Otherwise, I want someone with either talent or a position high enough to keep up with me and my ideas. The thing I hate the most are idiots, and I wouldn't be able to accept a romantic interest that wasn't either academically equal to me(or if possible, superior) or someone who I could thoroughly use to do what I want.
My favorite heroine gotta be Akane from Rewrite. She's smart, she has a high position, and I'd love to
She also has the right looks and is refined enough when she wants to be.