Forget the modern stuff, the movies, the arcade game or even the 90's cartoon.
Go old school... all the way back to the original look of the Eastman & Laird comics. Most people think they started with the TV cartoon. Your average kid today is probably completely clueless to TMNT's violent comic origins. Why are they all wearing Raphael's red mask???
It's a great theme for pinball though & could be a great seller if done properly.