We've actually been over this issue.
You may not have seen it, so a quick review:
I believe it was established that a fake handle of an obvious public figure who would never post here in real life was okay if the message was some generic joke or something, for example:
"Actually, the quote was 'one small step for a flan'" - Neil Armstrong
Unacceptable:
"Bowser sucks" - George W. Bush.
I see this thread as acceptable use since the fictional public characters are primarily flaming other fictional public characters, and not directing anything at a real person.
Moderators may step in at any point here if they don't see it this way.