I have had more interesting usernames elsewhere. I was "Paddy" on Techbrigade, ASCUK, UKASC and Arnies, on account of having Irish Roots.
As I got old and boring I just started using an abbreviated "real" name.
I remember a load of guys signed up to ASCUK as a team and were "Wolf Squad Gunnner" "Wolf Squad Sniper" "Wolf Squad Leader" and then pmd the admins for name changes when the team broke up.
I do remember the time HaVoC MaN got himself banned, and we weren't using validation on new users, so he immediately rejoined as Beakersuxcock...