Prospero totally does lead vocals.

He'll look a bit different, and actually I was just thinking "What direction might be fun to go with for a Mist Guardian" and Kid Magician kinda popped into my head, then I wanted to make him a Char Aznable reference somewhat and the rest kind of spiraled.

Hope he's okay. I'll probably have him open up to the other characters a lot more. 

[s]Also the terms of his contract clearly involve him crashing at Naoto's house in order to learn what family life is like[/s]