The Witches/WMG

The protagonist is Mr. Bobo.

I know that in the end the unnamed protagonist (this is for the book, I've never seen the movie) is still a mouse, but this is wild. Perhaps becoming a human again made him a crazy old man. This could explain his ability to communicate with the mice. And of course, his childhood dream was to have his very own Mouse Circus. Also, if you merged the universes, the Other Mother could totally be a Real Witch.