Originally Posted by Fleur du Mal

Brad - Dusty Limits, because he's got the boyish good looks, and seeing him play uptight and naive would be fun
Janet - Kitten Kapers, her innocent-to-saucy transformation would be ever so expressive!
Frankenfurter - Ant, so he can show us his dancing-in-heels skills and put us girls to shame
Narrator (Criminologist) - Decadent Gent in full decadent mode
Riff Raff - my brain failed here, anyone?
Magenta - Fleur du Mal (yes I'm selfish!)
Rocky - Casanova!
Columbia - Candy Jayne, if she can tap!