Depends on who you ask really, if you ask newbies, they'd probably say Engra, Longface, maybe one of the Ninjas like Recon or Daz, maybe one of the more popular members in offtopic like Bio. If you ask someone who was here for b.old, as Zonda said down below, Cortana Five,(or even a naked noob, or Captain K Mart,) or Achronos, but I'd also add to that any Bungie employee. I can't be the only one who thought "oh shit oh shit" whenever I saw some yellow text.