Fan Casting Batmechanic in The Bat-Family

the autistic son of Thomas and Martha Wayne's old groundskeeper who grew up on the Wayne Estate and was a lifelong friend to Bruce Wayne. When his own father passed away, Harold just kept working as the Wayne Estate was the only home he'd ever known so Alfred made him the new groundskeeper. Since Harold has always been naturally good with mechanical things, Alfred and Bruce relied on Harold to help them build the Batcave, trusting he'd be discreet as he's never been anything but absolutely loyal to the Wayne family. This Harold isn't mute. In his spare time, Harold likes to hang out and feed the bats, giving the new ones names. He never forgets the names of bats and can tell them apart