Rosenrot, O.J. Simpson, and Mrs. Butterworth also used to be on here all the time. I'm awful at remembering actual names though.
O.J. is probably still off working on an MBA or some such jazz somewhere...unless I'm even mixing up usernames, which is entirely possible lol.
O.J. = Ari Gold = Rob. And yeah, Im almost certain he was doing his MBA.
Mrs. Butterworth (Nick) was also a cool dude. He didn't post that much when I was around, but he certainly made them count when he did (e.g. exposing Astroboy)
EDIT: I just remembered about Logan. I don't remember his exact username (logan with some numbers afterwards), but he was posted some hilarious stuff. He acted like he was 6 years old, and he pulled it off so well I don't even know if he was trolling or not...