In theory, I have been around long enough to answer these, but there always seems to be such a massive turnover between my hiatuses that I have no idea who half these people are upon my return...
Best Avatar: I rather like
Jackhammer's Pink Freud, for lack of a comprehensive list to browse :P He's also had it for some time, which makes it easy for inactive lurkers like me to remember his posts!
Sexiest Member (Male/Female): Abstaining from these on account of not really caring that much what everyone looks like. Everyone knows it's totally
Urban Hatemonger though.
Most Inane: I had a very long discussion of why I felt someone was the most Inane poster here, then I remembered someone else: Hands down,
Tumor. I have never, ever seen her post anything remotely approaching interesting.
Most Enigmatic: Definitely
dankrsta. I get the feeling she's not around anymore, but if ever there was a poster that was a total black box...
Angriest Member: Probably
Paloma. There are lots of users on the forum that are very aggressively argumentative *cough*Big2*cough*, but noone has such a short fuse.
Biggest Drama Whore: Hum. If this were attention whore, I'd be able to answer, but Drama? I just leave when things get too dramatic, so I really don't know.
Nicest Member: Vegangelica. I love having discussions with Erica, cause they're always so... nice. Regardless of whether she agrees or not, she will always be more than polite.
Best Debater: There are quite a few people who could win this category. For me, due to exposure, I'm going to say
Tore. He is calm, collected, and always presents a valid, thought out argument. The same can be said for many other people I'm sure, but he's the one who I personally have had the most consistently well debated contact with.
Worst Debater: Truly bad debaters don't seem to stick around too long here - you either debate well or your posts don't contain enough opinion to be worth debating. For that reason, I can't think of anyone who is still around that I remember as being a bad debater.
Best Writer: Loathsome Pete. It was his "101 Albums..." list and the erudite fashion through which he explained the reasons why he loved each album on the list that got me back into checking these forums every now and then.
Biggest Virtuoso: Absolutely no idea.
Smartest Poster: See Above
Funniest Member: See Above
Best Mediator: Right-Track. Where did you gooooo?

It's hard to imagine MB without him, and he had such a presence that he could stop threads from spiralling out of control just by posting, because he, well,
was MB.
Biggest Troll: The Virgin. Had to be a troll, had to be...
Biggest Contributor: From what I've seen since coming back, definitely
Pedestrian, for sheer volume of interesting threads maintained.
Aaaand I'm not around enough to answer the rest.