I imagine all of Kubak, Darkstar and Ani as tall, skinny, black-haired boys.
Right? RIGHT?
Close, I'm actually a blonde.
Anyway, I think I should post the way I kind of see everyone on here.
Ratchetruler is just his avatar. I don't know, I realise that it's unrealistic and all that, but he's had that avatar for so long that it just seems like a part of him now, I'll be really disappointed when I actually see how he looks like (unless he actually looks like Qwark) 
I always thought Kubak would be sort of like that kid with glasses in Deadlocked (but human, obviously).
lombaxdude42 will always look like Sheldon Cooper to me.
HeatherGrace I don't really have an image for, since she changes her avatar so much (I guess we have something in common) but I always thought she'd sort of look like Elena Fisher in Uncharted 2.
Filip will always remind me of Al. Their personalities are just so similar (and he plays a game that's famous on the internet that I don't really care for).
Animovie kind of looks like a human version of Ratchet (if that makes any sense), so basically the kid in this drawing…
I think that's every regular member covered.