Nightwing (Arkhamverse)

Raised by his parents (better known as the "Flying Graysons") in a circus, Dick Grayson was trained to be incredibly acrobatic. His parents were killed after criminals had failed to extort money from the circus. Dick was soon adopted by billionaire Bruce Wayne, who shared his secret identity and extensively trained the boy to become Batman's sidekick, the first Robin. After he aided Batman for years, Dick eventually moved on and became a hero in his own right. As Nightwing, he patrolled Gotham City and Blüdhaven, and worked with Batman no longer as a sidekick, but as an ally.