well, i'm having the same problem, about two or more years ago someone signed up with the name "Karolk", recently i made some research and found out that he has 0qi and 0tc, and i was dumb enough to put those ugly numbers on my name, should have named myself something like "Loach" (because i love my loaches too much)... i think a moderator can delete players like this if you want to make a namechange (they cost ALOT)
BTW they don't show up in your custom folder if you don't meet them ingame or /dl them manually, so that isn't a problem.