Okay I had a go at a more comprehensive list:
_random_: Thoughtful guy. Not too good at driving, though.
Abaddon: NES proselytiser, farmer. Takes a lot of flak, some of it from me, but he's more fun than most.
aelf: Doesn't like Britain or British people. I still wuv you though aelf

aimeeandbeatles: Very sensible poster who just happens to have a bit of an obsession.
Ajidica: Also sensible, but does tend to go on a bit.
Alassius: All I know is that you live in the UK, sorry.
Arakhor: Gives off the impression of being patronising, but I don't think that's how he intends to sound. Generally a nice guy.
Ayatollah So: his philosophy posts are well-respected but they tend to go over my head.
Azash: Already covered. BRING BACK DATHIL
azzaman333: Also already covered! Hey have you heard the new album by Seven Mile Narwhal? They're very underground
bigdog5994: Blues-lover, Spongebob bath curtain.
Bill3000: Language nerd. In order to pull off a demeanor like Bill's you need to know your stuff. Luckily, he does.
bombshoo: I think you have a NES that needs updating, or something?
Boundless: Refreshingly un-Internetty. Also, 'nude slobs'.
Brighteye: To this day I'm not sure what he means by 'intuitively Bayesian'.
Camikaze: Worth listening to. Better mod than he's given credit for, I think. Also hosted an important Mafia game.
cardgame: Used to be a kinda sucky poster, but then he discovered ponies, and now he's a much more fun guy.
carmen510: All I remember about you is that you weren't very good at starting Mafia game threads. Sorry carmen

Catharsis: Once levitated a spider off a wall. I totally did this once you guys.
CELTICEMPIRE: Creationist, one of the S&T crowd I think?
Cheetah: Starts a lot of threads on subjects I'm not interested in. Probably knows his stuff.
Cheezy the Wiz: Used to have many facets; nowadays he's just a communist. Ask him about his unquenchable thirst for knowledge.
Chukchi Husky: Ridiculously hard on himself for some reason. Had a famous birthday thread.
CivCube: Back when I used to read the DYOS, his comics were my favourites. Joined only one round of EPYC though, which is a tragedy

CivGeneral: GMod wizard. Used to just complain, but nowadays he tries to improve his own lot. Good on you CG.
civplayah: One of the nicest people ever, but I haven't seen him in a while. Totally not 28.
classical_hero: YEC, slightly strangled syntax, Ana Ivanovic fan.
Colonel: 'the other guy' in the GDR thread.
Cutlass: Well he posts a lot but I barely know anything about him. Doesn't seem to be hated, at least.
Dachs: like Bill, he's one of those guys who it's easier to respect than to like. I like him though because of his good taste in music (Michelle Branch).
Darth Caesar: Came up with some Mafia initiatives but I'm not sure if they worked.
Defiant47: I think I saw him once commenting on the xkcdsucks blog? If so then he has correct opinions on webcomics.
Domination3000: Not too bad of a poster, any more (except when he's selling out his entire team in Mafia games

)
downtown: I know very little about him but I know the legends. Is he really sixty foot tall and made out of hope?
Dreadnought: Well I get the feeling that most of his OT posts are trolling, so who knows what he's really like.
DroopyTofu: threatened to change his avatar to a lamp and then TOTALLY DID
Dumanios: Sometimes plays in forum games… I really should be able to say more about him TBH
Eat_Up_Martha: Name is a Simpsons reference and that's all I know.
El_Machinae: smart guy. He's pretty rude, though - not the best quality in a mod.
electric926: when his computer isn't basically on fire, he's a good poster. Likes TF2 a bit too much though.
Elrohir: he ASSURED me that Obama would lose. Then I had to wear a silly avatar for a while. BTW I'm willing to bet against Obama this year, too.
EnglishCrusader: he says he is a troll, but he's a bit too unsubtle for that. Has the potential to become a well-known OT poster, I think.
Flying Pig: ex-military, decent chap, knows what he's talking about. Different from flyingchicken.
flyingchicken: Arrived in OT at about the same time as me, I think. Then he got distracted/corrupted by NESing. Not the same as Flying Pig.
GamezRule: at first he was annoying but now he's pretty cool (although I agree with tailless, his avatar is smug-looking. Go back to the M*A*S*H guy!)
Gary Childress: uhh, conspiracy theorist? Or am I thinking of Garry Denke?
Glassfan: I get the impression that he is a good poster who just doesn't make much of an impact on threads. That's a good way to be, though.
Heretic_Cata: makes the best music quizzes, so I forgive him for being a bit snobby about music itself.
Huayna_Capac357: already covered. Bet he prefers Seven Mile Narwhal's older stuff.
Hygro: cool guy who managed to hang around for years and years without ever getting noticed.
IglooDude: yeah, mod apologist.

Pretty reasonable; can't see where he's coming from re: guns, though.
innonimatu: His posts are probably too clever for me to understand. I can't really pass any judgment.
Integral: guy who has all the numbers. Had a PhD Comics link in his sig at one point, so unlike Defiant, his webcomic opinions are incorrect.
Japanrocks12: bit of a downer. Sometimes worth listening to, though.
Jehoshua: um, fundamentalist Christian of some denomination.
Joecoolyo: as cool as his name suggests. Is a cool Jew with a cool 'fro and makes cool Futurama references. Pretty cool.
JollyRoger: man I wish I was as sharp as this guy. Impossibly quick-witted. How do you do it?
jtb1127: Has a Sporcle quiz in his signature, so probably a good egg.
Kaiserguard: I think you're the only one on this list that I've genuinely never heard of or seen before this thread. BUT THAT DOESN'T MEAN YOU'RE NOT AWESOME

Kan' Sharuminar: the fluffy Scottish artist who likes Doctor Who and manages Wolverhampton Wanderers in his spare time.
KMRblue1027: back when I took a hiatus from OT you were just getting started here, I think. How's it going?
Kraznaya: not very likable, but it's not as if he cares.
leonel: Another guy who doesn't like Britain or British people. HEY AELF AND LEONEL: GROUP HUG??????
LucyDuke: unrepentant psychopath who gets drunk and batters snowmen to death. Do not approach.
Mad Man: he's funny, but sometimes difficult to understand. Also I think he's pro-Maryland independence?
madviking: slightly narcissistic, but makes up for that by being absurdly chill. Also, wears a dicky-bow to sporting events.
MagisterCultuum: master procrastinator. Basically came up with all of the lore in the Fall from Heaven mod.
Mango Elephant: a breath of fresh air. On an Internet saturated with snark, it's nice to meet someone who genuinely likes Nicki Minaj.
Miles Teg: a bit boring. Used to have an interesting avatar, though (it was, like, a crow, or a raven or something).
Mise: Guyanaman. Aled Jones fan, probably. Has very little hair left. Pretty sensible (other than the Aled Jones thing).
MjM: played mafia games with him when I was new: he used to get bandwagoned for stupid reasons. Also, iron cross avatars.
Narz: Good on you for continuing to 'keep it real', it's refreshing. Likes to buy silver. Has a child and a bad mother-in-law.
NBAfan: a fan of, uhhh, professional wrestling?
NickyJ: kinda naïve, can be difficult to stomach, but also sometimes says something really funny. I'm glad he's here, in any case.
NiRv4n4: only noticed you a couple of days before this thread was started. ALMOST KAISERGUARD-LEVEL AWESOMENESS
nonconformist: a veteran poster, probably the main voice of the true left in this place (or at least, the one I notice). Got into the papers for literally sitting on his arse for six weeks.
NYHunter: spaceship avatar, I think. Other than that, not sure, sorry.
Owen Glyndwr: I wish he'd say more original stuff instead of just seconding what other people have said. Also I don't like his current avatar, go back to the baseball one or the Grateful Dead one.
ParadigmShifter: the main font of silly fun in this place. Mods, please don't ban him, we need him. Does maths for a living.
Perfection: Originator of the EPYC concept. Tends to post stuff that I wish I had posted. Designs spaceships.
PeteAtoms: is a 'bro'. He has a bro hat and does bro-related things with his bros. Brodacious!
PlutonianEmpire: kinda puppy-like.

Has some Views about sexuality, but otherwise harmless. Blue aliens mating with humans.
Quackers: underrated in the funniness stakes. Talented at getting under lefties' skin.
Richard Cribb: he scares me.
RedRalph: starts some pretty dull geo-politics threads, but then occasionally he starts off about hammer parties, and then the world is alright again.
rugbyLEAGUEfan: another guy who makes me jealous because of how funny he is. Changed his name a bit during my hiatus - it looks a bit weird now.
Silurian: sensible but often overlooked. I think his location and signature must be references to something I don't understand.
Skwink: where did 'Caesar' go? Funny poster, former mafia partner of mine (we ALMOST won

), posted the same picture of himself twice.
Smellincoffee: Nehru patriarch, Frank Sinatra fan, atheist (but former Catholic I think?).
SouthernKing: S&T poster, one of the new Forum Games breed. Don't know much about him but he seems decent.
SS-18 ICBM: Talks about science a lot. He also likes to contribute by posting a picture.
SuperBeaverInc.: best manager West Bromwich Albion could ever hope to have. Does a lot of AOG stuff that I don't read.
taillesskangaru: You are rad, taillesskangaru! YOU… ARE… RAD!
Taniciusfox: possibly CFC's most affable poster. Possibly also its most affluent.

Likes a whole bunch of stuff, I think it's all listed in his sig.
Traitorfish: saw him in the comments page of a webcomic once, but can't remember what it was so I cannot evaluate his webcomic opinions!

Clever but sometimes misses the point of things.
tycoonist: Once took a bunch of weed on a school trip for some reason. It's decisions like that that make him worth listening to.
uat2d: used to be 'garbageinhere'. Posted a lot during the merger prank, as did I. So we are both from the 'Class of April '07'.
Verarde: keeps getting grounded as soon as he's called upon to do anything. That's a shame because he's pretty cool! Plays drums, looks like Bigfoot3814.
Virote_Considon: idolises Alexei Sayle. Has managed to grow up funny regardless of this. Likes ska. Writes Young Ones fanfiction.
VRWCAgent: the most decent person. Impossible to dislike. Likes purple martins and has a big NASCAR mug I think.
west india man: Listless pseudo-Brazilian. Don't listen to the rest of these clowns - keep the moustache, it will become mighty in time

Whiskey_Lord: he's an interesting character, but I get the feeling that he doesn't know as much as he thinks he knows.
Yared: super-nice super-Swede, sometimes super-Eritrean. Another one of those 'impossible to dislike' fellas.
Zack: Already covered, but I didn't mention anything about organising Mafia threads so here goes: he also does that.
Zelig: tends to substitute snark for opinion, which is unfortunate. Also he is 'Mars'.
Ziggy Stardust: oh thank God I'm finally at the end of the list. ZIGGY STARDUST IS A DUTCH MAN WHO SMOKES THE WEED THERE I'M DONE.
EDIT: HANG ON I MISSED ZELETDUDE
UMM
I REALLY HAVE NOTHING TO SAY ABOUT ZELETDUDE