He is a tough one, I could see him being of Space, Light or Mind aspect (Big Picture, Knowledge/Luck, Choices) and most certainly a Seer or Mage, maybe even a Muse if you want to remove the gender exclusivity.
Ultimately I think I would go with SEER of SPACE. One who uses their knowledge of the Bigger Picture to guide their friends. Perfect for a DM of his caliber.
Also from the extended Zodiac explanations, Space players "... tend to be innovators, concerned with creation and redemption. Catch them recycling the old to make the new, the fresh, and the beautiful. For the Space-bound, the journey is as, if not more, important than the destination; how they do something is as important as what they do. At their best, they are steady, impartial, and creative." Which I think fits him like a glove across all his dropout appearances.
Zac would obviously be a Time player due to his excellent comedic timing. The Class was the real challenge here. Initially I was thinking Rogue or Knight, one who steals from their aspect to benefit other and one who uses their aspect as a weapon respectively. But I ended up going with the class that invites destruction through their aspect due to Zac's timing obliterating all around with laughter thus making him a BARD of TIME
I know the least about Mr. Ruben out of the Noise Boys. That being said, I think I would have to go with KNIGHT of VOID because 100,000 BATMANS