I would think you would have to include some of the important early users, most notably vroom who was for a long time considered the "owner" of PerlMonks; also nate, CmdrTaco, and chromatic (who has the distinction of being the earliest (real person) user still active on the site).

Also CowboyNeal, who was the object of many running gags.

Also TimToady, for obvious reasons. :-) And similarly merlyn.

Critical: root. This fella owns many nodes at PerlMonks, and sends you messages, e.g. when someone replies to a node of yours.