It seems I'm one of the few members on TFN that doesn't have a Sci-Fi/Star Wars-themed name.
There's a nice chunk of people with non-SW/sci-fi names, but they generally hide in the non-SW/sci-fi boards. One of the mods consistently uses a Deadpool avatar, there's people like I Are The Internets, A Chorus of Disapproval, Falcon, Juliet, Goodwood, Cooper_TFN, jcgoble, we have a Zapdos running around in the JCC, Slowpokeking hangs out in Lit sometimes, along with jacktherack, and jasonfry (who is a SW author), and then there are the people with just plain old normal names.
So, they do exist, but you need to look for them. A good many do hang out in the Literature forum under the Expanded Universe tab.