Mine's Boris Johnson, though he's often mistaken for Donald Trump on these forums it seems. He's the best politician Britain has to offer currently, by which I mean his politics are still usually awful, but he's got a fantastic personality, knows how to appear to be likeable and isn't afraid to make gaffes which, somehow, then go on to strengthen his career instead of destroying it. He's also pretty funny and whenever I hear him speak I just kind of love how antiquated he seems.
For example:
So yeah, Boris. As for changing it, I don't. I've had Boris for ohh, about 4 years now. Before him I had an awesome animated avatar of Cloud from Kingdom Hearts but, alas, that is now lost to a dead hard-drive. Still, I like Boris. Wouldn't dream of changing him.