In a bar fight, I would definitely want Hime from Princess Resurrection on my side. You can never go wrong when you have a chain saw wielding chick on your side. Of course, Hime may be just as likely to sit there and just watch, while she sips at her tea. Though I’m sure Liza would lend a fist/paw.
I also considered Sanzo from Saiyuki, but he would be just as likely to turn around shoot you, if you annoyed him anyway. And really, it’s very easy to annoy him.