Richard Grayson (Earth-4678)

"Don't let the pretty boy looks fool ya, Nightwing here is tougher than he looks."

- Penguin

Richard "Dick" Grayson was part of a circus family, dubbed the "Flying Graysons" for their death-defying stunts and acrobatics. After a performance that Bruce Wayne was in attendance to, Dick was left an orphan by the hands of Maggia mobsters after they cut the Grayson's tightrope mid-performance. Feeling sympathy for the child, Wayne decided to take the boy in as his own and treat him as family. Eventually, Wayne gained enough respect and trust for Grayson that he bestowed him the great secret of his true identity, even going as far as to train the acrobat and develop a new sidekick - Robin. He later became Nightwing, and started acting on his own in Blüdhaven.

Source

 * https://dc.fandom.com/wiki/Richard_Grayson_(Arkhamverse)