I believe she wants a separate display name possible for each account, the names would be each character and the "game" is the forum itself. Basically a whole slew of display names/profiles that'd belong to a singular account.
It's kind of out of scope for a forum software title, and would only be used by a small subset of forum installs; so I don't see it as really being a useful stock feature. Especially the amount of time required to make it work...