I picked my username in 1996. It was either this (Brak) or SpaceGhost, as, at the time, I was all about SpaceGhost Coast to Coast. SpaceGhost is my favorite character, but I chose Brak because it was short and had a better ring to it.
With the success of Adult Swim, which made it shittier, I thought about changing my username, as I loved Brak around the days of Cartoon Planet and when he was a guest character on SpaceGhost Coast to Coast -- not The Brak Show.
Maybe I should have just chose SpaceGhost?
I'll also use the username "Brax0r" (like my gamertag), which is a mixture of "Brak" and "Hax0r" -- which is entirely a joke, as leet speak sucks0rz. :O