Well, to give some insight seeing as everybody is "I dunno" about it;
I remember Sasquatch99 as the guy with Sylar in his portrait. I recall finding one of his posts a little much of a too lame attempt at funniness, but I don't specifically like or dislike him. Furburt's avatar I recognize, and iirc he made the Ask an Irishman thread some days ago. Random Argument Man I have actually remembered for ages, because of his lame-in-a-good-way name, though I haven't specifically noticed the content of his posts. Exactly the same for the Incredible Bullshitting Man.
As for Fat Man Spoon, I recognize him by avatar but haven't had much insight into the quality of his posts. Same thing for Baby Tea, Maddawg, Monkfish acc, Anthony87 and Mazty.
Ravens_nest I remember for making 'average' posts - what I mean here is that (for as far as I recall) I've never seen him bring in a point into a discussion that actually made me sit up straight to think about it, though his posts usually do make sense.
Avykins I picture in my mind to be exactly the same guy as on his avatar - from what I seen of him he's not a bad guy but can be rather snibby, which is exactly the same way I imagine the chap in his avatar to be.
Whenever I see AkJay's avatar, I hope that's not him in real life. If it is, he's a store manager with a 9to5 job who should really shave =P. EmileeElectro I vaguely recall. I'm sure I've seen the name in a specific topic before, but because the avatar has changed I can't recall where I've seen her. Damn you! =P Wouldyoukindly99 I remember for making that classical music topic not too long ago and my memories of him are edgy towards positive for this.
All the other people in the thread I do not really recognize at all. There are some avatars I vaguely know I've seen before but nothing that specifically rings a bell.