MythandLore -> Ah, ok, I misunderstood. I thought you were talking about a photocopied character sheet. No, if you buy a character sheet you can do whatever you want with it, save copying it (well, you can copy it, but only for personal use). I think. Probably. Though IANAL.
But, all MMORPGs I know say in the license agreement that characters remain property of the company that made the game. Even if that wasn't explictly told, a court could easily consider the character as a derivative work of the program, and therefore a proprierty of Mythic (since, remember, you never own the program, but only the right to use it).