You break her heart, she tears your's out.
The lovely Lucy from that blood-drenched emotional masterpiece Elfen Leid. Lucy has been a favorite of mine for a good few years now. The show itself is a wondefully balanced mix of gorey vengeful violence, which in turn is usually counter acted with some light hearted emotional developments as romance blossoms between her and the male protagonist Kohta.
The show is ememsly creepy and the gorgeous soundtrack deliver a disturbing yet touching story.
I always felt the relavence of the horns to be the creepiest feature about her.