I chose mine in a hurry, I wanted to quickly make my account because I desperately wanted to favourite some Mobstergirl mamga :P I put the 1337 there because 'RobinHood' is apparently already taken.
Mine's the same as all my other usernames. Originates from "I am the Walrus" by John Lennon. Nope, it's not the sonic villian.
As far as I could tell, EggMan has no definition in the song. I chose to define it with myself: I AM the EggMan.
The Z at the end is my first initial irl.
Azelle is the name of the first female cleric character my brother used in Dungeon & Dragon game. Since he potrays her as his ideal girlfriend (and I take her character as my ideal elder sister) thus he put 'Fans' at the end of her name.
I made mine after the scanalation group I'm part of. Now I want an username to myself. *sigh*. But giving Jacob a PM Requires too much physical exertion.