Nightwing

Dick Grayson was Batman’s original Robin. As he grew up and distanced himself from his mentor, he adopted the identity of Nightwing. Nightwing is famed both as the leader of several super-teams (such as the Teen Titans or the Titans) but also as a solo vigilante.
== Biography ==
=== Early Life ===
When Dick Grayson was a child, he was an acrobatic prodigy travelling with the world-famous "Haly's Circus" along with his parents John and Mary Grayson. The three performers, known as the Flying Graysons, were one of Haly's most famous acts, a fact that went to Dick Grayson's head. Grayson, becoming rather pompous, began to drive away his closest friends Raymond and Raya. However, during a major blackout in Gotham City caused by the Riddler, Grayson, who had decided to see a movie while Haly's Circus was in Gotham, was caught alone in the streets. Working with a couple of other kids, Grayson managed to survive the blackout and return to his family at Haly's camp. From the experience Grayson learned not to take his friends for granted and apologized for treating them so poorly. 
Haly's Circus hid a dark secret, having been training assassins for the Court of Owls for decades. Unknown to the young acrobat, Grayson had been selected to become the newest Talon for the Court; being groomed to replace Alton Carver.
Dick Grayson's parents were killed by the mobster Tony Zucco on his mother's birthday, leaving the acrobat an orphan. Unable to work as an acrobat anymore, Grayson left the circus, unknowingly escaping his fate to become a Talon.
===​Robin: Boy Wonder===
After being transferred to the Wayne Care Center, Bruce Wayne would occasionally check up on Grayson and help him out. While Grayson seemed to be recovering well from the tragedy, he would actually sneak out at night in order to conduct his own investigation into the whereabouts of Tony Zucco. Grayson would encounter Batman at various times, and the Bat helped Grayson with his investigation, empathizing with his similar tragedy. 
Eventually, Batman brought Grayson to the Batcave and shared his identity as Bruce Wayne. Wayne then offered to help Grayson bring in Tony Zucco, a notion that Alfred Pennyworth was reluctant to accept. Grayson accepted Wayne's offer and Wayne began training him over a period of a few months. After initially having trouble accepting a name, he finally settled on Robin, a reference to an adoration his mother had for the bird. 
One night, Batman was tracking the Assassin Lady Shiva before the hero was ambushed and bested by her in combat. Donning his costume early, Robin arrived at Batman's position for his first mission in the field but was no match for the assassin, who spared his life and said they'd meet again. 
At some point, Grayson partnered up and bonded with another teenager that Batman had taken under his wing named Barbara Gordon, also known as Batgirl. Though both had feelings for the other, and both knew that the other had such feelings, the relationship never went any further
===​Teen Titans===
Dick eventually went on to join a team on teenage superheroes known as the Teen Titans. The group consisted of Robin, Kid Flash, Speedy, Aqualad, Donna Troy and Omen.
===Deal With Deathstroke===
At some point during his time as Robin, Dick was confronted by Deathstroke, the world's deadliest assassin. Deathstroke made Dick an offer: guide Deathstroke's daughter, Rose, down the right path, so she doesn't follow in the footsteps of her father. In exchange, Deathstroke would stop trying to kill Dick and the rest of the Teen Titans. Dick accepted Slade's offer and began training Rose.
===On His Own===
Years later, Grayson and his mentor had an argument, resulting in Dick leaving Bruce's side and taking up a new identity as Nightwing. Nightwing eventually left Gotham, occasionally returning to mentor the next Robin, Red Robin and further train Batgirl.[9]
When Batman was apparently killed by Darkseid in one altercation, Grayson accepted the role as Batman for Bruce's sake and took Bruce's newly discovered son Damian on as his Robin. They would form a close bond while working with each other, fighting against the likes of Professor Pyg, the Joker and Dr. Hurt, until Bruce returned and retook the mantle.