Nightwing
Nightwing is a fictional superhero appearing in American comic books published by DC Comics. The character has appeared in various incarnations, with the Nightwing identity most prominently being adopted by Dick Grayson when he moved on from his role as Batman's vigilante partner Robin.
Publication history of Dick Grayson
His activities with the Titans would lead to him to having a fallout with Bruce and straining their relationship and forcing him to become Nightwing. Their relationship with each other would worsen throughout the years and only begin to restore until after Bruce, with a broken back, lets Dick substitute as Batman, being his prodigal son. Following Bruce's absence Dick became Batman and Damian Wayne his Robin but Bruce's return sparked changes in the city that forced Dick to return as Nightwing after a whole year of being Batman.