Harold Allnut

If you’ve wondered how Batman can build and repair all his equipment on his own, wonder no more. He has the aid of Harold Allnut, a mute technological genius who suffers from Kyphosis. Serkis would shine as the helping hand.

This would be a relatively minor role, but it would answer numerous questions about about Bruce Wayne and Batman.

We wouldn’t object to maintaining his comic book origin story or seeing him depicted as having previously worked for a Batman villain. This would serve to enhance both Allnut and Batman as characters.