Who the hell do you think Kamina is?!
I think Kamina's personality is kind of a give-me since he doesn't make much attempt to conceal it, but really, one can never be too sure. Kamina is brazen, bold, confident in himself to the point of arrogance. He's pretty thoroughly convinced that he's a one-man army and isn't afraid to shout it out to anybody in hearing range.
He stubbornly refuses to back down from anything even remotely like a fight or challenge, even when it's painfully obvious that he's totally outmatched...he can be convinced but it takes supreme effort and reasoning.
Also, despite his ego, rather than express superiority toward others Kamina is the type of person who wants to encourage EVERYONE to step forward and attain greatness of their own. He hates sneaky or underhanded tricks, however, and he fiercely opposes anyone who tries to oppress or bring anybody else down.
Obviously, he's prone to using the catch phrase "Who the hell do you think I am?" Also feel free to note, the italicized staticky sounds that start his comments and postings are from an inexpertly-handled comm device given by Metatron, so those don't have to carry over.
...wow, that ended up pompously more windy than anybody else's. *finds a rock to slink under now*