I can see that. It would make it more Believable because unlike spiderman, or batman Heman transforms into another person...or a bigger version.
We all know topher grace can do goofy. he did it so well in that 70s show. And if "donna" played Teela it would rock. There interaction was spot on. Although I wonder if people wouldnt like it cause it would make them think of 70s show.