Let's see...
I always relate Proto to Viewtiful Joe.
Yamaneko is obviously Link.
eestlinc is whats-his-face from FFT.
foa will always be Lego Ed from Cowboy Bebop
rubah will always be Rinoa and Hsu will always be Citan
I always relate kikimm to the avatar she had for a long time after I joined, and Caim from Drakengard.
Psy is either a P or the pink bunny.
Most of those are pretty obvious, and I'm sure there are more, but I can't think of any off the top of my head.