Lurker usually; I remember lurking for years at some forums and never signing up. Not sure what I am when I'm not lurking, though; none of the archetypes on there seem to apply, as far as I understand them. They all seem rather attention-seeking in a way, and I'm usually content with people barely noticing I exist. Like an NPC, sort of.
Suffers Newbies Poorly, more typically on other sites though. I do recall reading that article ages ago and pretty much going "oh hey this sounds like me".
Honestly, a majority of these tropes are on trollish types rather than the actual components of your typical online community. Pretty disappointing.