I think the answer is pretty obvious when you think about it. It's like folks will always ask you who was your favorite Ninja Turtle? (Michealangelo, for the record.The party dude aspect always appealed to me.). Everyone's got a thought out answer that is in someway telling about how they see themselves in this world. But great villains are what really make it for me, and Bebop and Rocksteady where definitely that. Cooler than Shredder for sure.
Anyways, back to drawing.