Having to choose, I'd say Chopper from One Piece. The sweet blue-nosed reindeer, how can't you love him?
*hugs an imaginary Chopper plush doll*
Other choices could be:
Knives from Trigun, so that I would have Legato-sama always by my side :O°°°°
Kaworu from Evangelion. In other circumstances I would have said Asuka, but since I already am bitchy enough, I don't see why I'd have to be like her... I'd rather be a good creature just for once
Or maybe Masami Eiri from Serial Experiments Lain
mwahahahah!