to be completely honest

[DarthTyrael]

I disagree slightly.
Usernames should be able to contain anything (aside from profanity of course) as they're mostly used on the forums and to log in to SLO.

The thing you'll see most profoundly is your character's name, which imo, shouldn't contain any name's from the narutoverse (Uchiha, Uzumaki, Nagato etc.)

So yeah, I'm okay with a filter, but only for the character's name.