Trolls - One the worse thing to come across, crafty, and bend the wills of oters for their entrainment.
grammar nazis - They hold proper sentence structure and spelling above all else, and believe their vigilantism keeps order in this realm.
flamers- Not as subtle or crafty as trolls, but can quickly send a forum board into chaos
furries - The furries, in the real plane they are human, in this plane they are something else, and get into everyones business. they are the main prey of flamers and trolls.
lurkers - they watch, listen, and wait, gathering information for the end times
mods - The gods of this realm, some are all powerful, wielding their mighty ban hammers. But many places are prone for theirs mods to sleep in great slumber and the trolls and flamers will coe out of their pits to reek havoc.
So pretend the internet is a Roleplaying game, any other races you can think of, or any fantasy rp similarities or counterparts you can think of.
Try not to spam and keep it pg-13 because we know it can get out of hand with the whole of the internet.
ooh one more - neckbeards.