As for the genre. Drama or tragedy sounds good.
Let me give some examples.
Himegoto - Juukyuusai no Seifuku
Mikako.
Spoiler (mouse over to view)
She doesn't mind sleeping with a guy just to protect her love (Yoshiki) from that guy.
Oboreru Hanabi
Koaki.
Spoiler (mouse over to view)
She wants to be with the protag, but since her health condition doesn't let her be with him, she doesn't mind crippling him.
Nozoki Ana
Emiru.
Spoiler (mouse over to view)
All that blackmailing! huehuehue
Kodomo no Jikan
Rin. To some extent she matches this type.
3D Kanojo
Iroha. In the first volume she was really awesome, though later she softens a bit too much.
Sundome
It's been a long time since I've read it. I just remember that the main girl was like what I'm looking for.
P.S. If it's possible I'd like the main guy to be strong. Spineless cowards are really getting on my nerves.
Last edited by momimomi at 6:37 pm, Feb 13 2014