The Bat Devil is a Devil who embodies the fear of bats.
He is a gigantic humanoid bat creature with sharp teeth and large round eyes. His arms are connected to his torso by flaps of skin which serve as wings that make him fly despite his enormous size. He was strong enough to threaten power and take her cat, Nyakko, hostage. He was misanthropic as he saw humans nothing more than source of food. He got killed by Denji.