If you could wake up and spend 24 hours in an online game with any weapons/powers, would you do it? If so, what type of game would you choose, and why?
Depends. 'Online game' doesn't include Kingdom Hearts, which I would spend time in in a heartbeat.
For an online game, I'd probably have to say zOMG from Gaia Online, since it's the only online game I play. It's a game where you fight with rings, so it's not quite as cliche as others, my reason for enjoying it.