If no one else is going for it, I had a Dark Knight idea I was really jonesing to try out, hopefully tomorrow I can finish up the sheet + a drawing of the character.

Concept: 

Shy, boyish, easily flustered, generally nice, heavily self-doubting, bit of a worrywort.  Fears loneliness, fears weakness, fears his own personal fragility.  Character's use of darkness augments his own self-destructive tendencies, and his 'darker urges' in this case are to either completely disregard his own well being and value as a person mid-fight, or to just shut down and refuse to engage, thinking he's useless and there's nothing he can do.