Billy Bat  

Bat Boy, The Bat, ビリーバット

Essentially, a fictional character in detective comics who is depicted as a talking anthropomorphic bat with an ambiguous true nature and purpose that serves as the central mystery of the plot. Francis Xavier expressed uncertainty about whether The Bat was an angel or demon or both, while Zōfū believed there were two bats - one white and one black. When The White Bat appeared, it spoke in a confusing manner, and when The Black Bat emerged, it manipulated people to engage in negative behavior.