Sure! Speaking in terms of from behind the monitor, I'm a programmer and network engineer in training, 17, male, rarely angsty, and with a relatively high pitched voice (by American male standards. I sound kinda like a kid) and very distinctive cackle for a laugh. I have long hair, and people seem somehow convinced that I'm a stoner. (I'm not.) I do have a tendency to greet people with "hey, man", though. Once I get on a topic I like, I do not shut up, and I'm quite nervous in crowds. I'm slightly disappointed that I'm terrible at being intimidating, but on the flipside, I'm considered somewhat cute by some people due to it. Cynophobic, macrophilic, and celibate. Some consider me a brilliant mind, though I have a heaping helping of ditziness on top of that. Think Miyuki from Lucky Star, but toned down a bit in both regards, and with the geekiness of Hiyori. I also tend not to swear much.
On this side of the monitor, I'm a lot calmer, though more blatantly a prude. I have somewhat of a reputation simply for being an openly macrophilic Touhou fan, since a lot of my "brethren" (my term for fellow macrophiles) are quite often nervous to bring up such things due to the ridicule it brings. Personally, people are more baffled by my disdain of sex, but anyways. In many of those little "writing challenge" questions on /fs/, I've been put in the role of friendly giant (and I'm certainly happy with that!), though other sites of the internet brand me as a "murder fetishist". I imagine those'd be pieced together in the form of a friendly giant who gets a bit aroused and/or destructive when repeatedly reminded of his stature, but otherwise is rather cooperative.
Oh, and I love cool cars, too, but I don't drive yet.