This is only my second post, so please be kind and bear with me. 

I don't see many choices of factions to use for the proposed Wizard of Oz. Without providing any idea suggestions immediately the first image that popped into my head was that Middle Munchkin Kid from the Lollypop gang, twitching as he walks, being from the Dwarf faction in the role. Heavy artility and explosives disguised as candy surrounding him. 

I think the reason why my mind went there was because you didn't specify if this character is someone that was once a character in the story, not already included like Glenda, Munchkins, the actual Mr. Marvel dude, etc., or just someone from the factions that developed into and became the Wizard and will this Wizard have REAL or just flim-flam magic tricks? That would make a difference in the artwork! 

I'm not much of an artist, but I put a description into my browser's AI, and it has come up with some far-out artistic renditions, that I wouldn't dream of submitting! They're too funny! Just wanted to get other people's feedback on these issues. Thx! Opal