I've had my username since I first played KotoR, and thought that Mandalorian dueling champion was a total badass. Over the years I've ended up using it (often with 212, which is essentially random but kind of a cool number) for almost everything, mostly because I don't want to remember which name is for which account (which is also why I only have 3 passwords among all my various accounts. Probably not very secure, but otherwise I'd never manage to login to anything a second time)