Originally posted by MadMel
Any character that you can completely customize (like say, your WOW toon, or the main character of Jedi Academy) is what I mean by 'unknown'
JA is probably a bad example, since Jaden turns out to be a canon character in later star wars books, but you still get the idea.
Honestly, it's never come up.
However, considering the fact that people are supposed to list out exactly what powers and so one said characters have available to them in the match, I really don't see it being a huge problem if someone wants to use a WoW or Guild Wars or whatever character.
(and god, I hate the word 'toon' in reference to game characters, it doesn't even make sense. Random pet peeve of mine)