I don't know about anime, but my GF seems to like this "Akari" girl with pink hair, so I guess I'll go with that.
Spoiler: Ergo Proxy : Agent of Death Spoiler: Death Note : Yagami Light Spoiler: Hellsing Ultimate : Seras Victoria Spoiler: Youjo Senki : Tanya Degurechaff
Main character is pragmatical, vicious, corrupt cynic and borderline psychopath. It is crazy, mindful comedy. I did laugh a lot. And I want more. It deserves more.