Have to say Raistlin as well. After that, I'd say Ordu, Orwen, and Orgoch. They may not technically be wizards, but then, alot of the names I've seen here are not wizards either.
I would like to see as much character customization as possible, in terms of powers (is that the correct term that the game is using?) and skills. I imagine multiclassing would create alot of balancing issues - although it doesn't seem to create any more when comparing some of the better classic NWN private servers to WOW.…