I'll start with the three usernames I've had here:
Blaziken - my favorite Pokémon
Lucifer - my favorite character in the Bible (the fake one theists believe in; not the actual Bible that only mentions "Lucifer" as a title for a Babylonian
king, an angel
One Above All - the Marvel supreme deity
And here's another one I've added to my list of "Also known as:" in my sig:
All In One - one of the Vortigauns'