I'd have to go with Haruko Haruhara from FLCL. I can't stand her...
She is ridiculously sloppy and doesn't seem to give a crap about how anything looks. Not a good sign.
She beats people... I wouldn't wanna get hit with a guitar all the time, I'd have to stay away from her cause I fight back, but I'd never hit a girl. So best bet is to steer clear of this one.
Not to mention she's just plain psycho!!! No thank you, I don't need no crazy's. And I wasn't a big fan of FLCL all together. :/