It didn't last too long, but I ran a Champions campaign where the characters all had a MysteryMen vibe. The Narwhal, The Green Hood (a guy whose schtik was that he had a green hood)... some Native shaman who had had the left side of his body replaced by a living tree, I can't remember what name...
This is such an interesting and creative thread that it has spurred me, a lurker who hasn't played an RPG for about 15 years, to register and post. Slaad are cool. :cool:
One idea that I've had for a while that I offer up to you relates to the batarachian forms of the slaad. The way I see it...