I don't know most people here, so I don't have many impressions of them. I have a very general first impression of Arclight and it is that of male and somewhat knowledgeable. I get that from the cool-sounding username, cool-looking space avatar, and from what I vaguely remember him/her posting while reading threads.
"I see you're drinking 1%. Is that because you think you're FAT? 'Cause you're not. You could be drinking whole milk if you wanted to."