I really like mature characters over the extremely common teenage characters.
edit
xil puts it in better words:
Xil wrote...
Old enough to not be little bitches.
Can't stand a hero unable to comprehend the world as anything more than black and white... There are multiple sides to every story! Have the mental depth to rationalize the situation prior to rash action! Just because she's a girl, doesn't mean she's incapable of self protection!