I wasn't originally going to say anything, but I feel like it's sort of necessary.
On our forums, "souper" is indeed the username of a member who just recently joined, and yes, she does say she is Superfeesh and Onowl. We haven't had any reason to believe it isn't her, though, and if we haven't found supportive evidence then I don't see why we should do anything about it. One of our admins has already contacted Onowl on the Aro'kai forums as confirmation just to settle everything.
Furthermore I don't see how the Thirku forums is a 'random' forum, as you put it. Thirku and Aro'kai are both CreativeMMORPG games in production - it makes sense for us to scout each other out. We're direct competitors in this regard. Plus, on the forums, souper has been nothing but pleasant to all the members and has even made some friendly suggestions, even wishing us luck with our game.
I'm not saying we won't keep an eye out for problems like this, as I know they have happened in the past. I just don't think that we should immediately assume that she's a fake without any hard evidence to back it up.