Drinky Krow is the only one I knew. I actually had heard about his antics before I ever posted on GAF. Thats...impressive I guess. Shawn Elliott and his friend Rory had a couple of joke characters on the old 1up boards. It got to the point where any member posted something remotely ludicrous, it was assumed the were an SE joke character. I think I know who a couple of them were, the legit ones, because he posted about it here.
Good times.
Good times.