There are only so many contextually appropriate novelty names available. It wouldn't make much sense for someone to swoop in and begin posting in character as any random character. So far as I know, we've got Clippy, Voldemort and Quirinus Quirrel, and... one other, maybe?

If people showed up and began noticeably posting in character as random vaguely (anti-)rationality-related characters (Spock, Kamina, Pinkie Pie), we'd have a problem. Fortunately, they don't.