The Sonic the Hedgehog film franchise has an interesting relationship with its source material. They aren't faithful adaptations, but they liberally borrow concepts to serve as fun references and callbacks. The characters feel note-perfect, but the story has next to nothing to do with that of any particular game. As it goes on, the franchise will pull more and more from the games while maintaining their distinct storyline. The games introduced the E-100 series of robots, which evolved through several entries. The same gimmick could add a lot to the films.