When I played WoW, I had an alt Mage named Mizzee - the nickname of a former Blood gang member who I bought weed from in high school (wow, that looks terrible spelled out in front of me)
J*zzwizard and F*cknugget are common RPG names for me; though for my main characters I usually use Desfeek.
I didn't come up with this, but I saw a post on NA about naming your Metapod in Pokemon "P*nis": "P*nis used Harden!" - needless to say, when I heard about that, my Metapod's name forever changed.
My little brother always names his characters "Jesus" - best in Halo: "Jesus was killed by a peen."
Lastly, we have a guest account on our 360 called "about 40 jews" - again, for the entertainment value in Halo













