I have a odd username and I hope that when we do switch to the new forum that my username will be unaffected but my question is if the username system does change and my username is then made illegal how would we go about fixing that?
I still don't understand the question of the OP, can you reformulate better the question? Thanks for the attention.
I don't think your username will be made "illegal," (I assume what you mean by illegal is no special characters in the username.) but even if it does, the forum probably would either make an exception for you, as you signed up before the new forum came out, or just remove the special character from your name. (In your case, the "~".) I'm not part of making the new forum though, so I can't be completely sure.
riformulareIf the problem is the special characters, I think it will not change anything. The slickage team will move all the entire database from here to the new forum software (and I hope no forum users will lost during the migration).