1. Being a cool person
2. Not thinking their talented provided they aren't
Both are necessary. It also helps if they have an alt who's like.. a druid or rogue or priest or something other than pally and hunter.
Pally - Tyrrone - Me and a friend were originally making stereotypical "black/ghetto" characters.. She never really finished hers
Druid - Fural - Play on feral and fur.