Some of my favorites include ipwn1337noob, ImTroublesom, Thinkfast63, UGOTOWNED22, XxV4D3RxX and iLoveGunzzzz.
Couldn't Take It No More
So I Became Hardcore
Any of the infinite variants of 'Sephiroth.'
One you get up to three X's, two ys, a dollar sign and an underscore, you might want to just pick a different name.
Loric i mean really
Anything that tries to be funny or troll.
RP friendly names should be required.
Some of my most used names.
and there is more but dont feel like typing them all
i like BoxOfDreams and WillowMist