Dick Grayson

Early Life
Richard "Dick" Grayson was born to John and Mary Grayson in Bludhaven, New Jersey. As a child, he and his parents were a family of circus acrobats known as The Flying Graysons of Haly International Traveling Circus. While he was preparing for a performance one day, he overheard two gangsters who worked for a crime boss named Tony Zucco attempt to extort protection money from the circus owner, Mr. Haley. The owner refused, and the two gangsters sabotaged the trapeze wiring with acid. During their next performance on the trapeze, his parents were swinging from ropes when they suddenly broke, causing his parents to fall to their deaths. Bruce Wayne, who helped to get the circus to town, was in the audience and witnessed these events unfold.

Before he could go to the police, Batman appeared, and warned him that the two gangsters worked for Tony Zucco, a very powerful crime boss, and that revealing his knowledge could lead to his death. Bruce arranged with Commissioner Gordon of the Police Department to become the young boy's legal guardian. However, in the rather large and empty Wayne Manor, Dick became more and more detached. Alfred Pennyworth brought this to Bruce's attention, who was in his fledgling years as Batman, and had little time to spend with Dick. Eventually, Dick went out on his own and tracked down Zucco but was caught. Batman saved Dick and took him back to the Batcave, where he revealed his secret identity, which was the one of his legal tutor, Bruce Wayne. After personally training Dick, Bruce allowed him to become his partner, Robin. They eventually brought Zucco to justice together. Robin intensely feared that he was unable to be as fearless as both his biological and adoptive families are supposed to be, and was afraid of the fact that he would someday have to fill Batman's boots

Robin
At the age of 13, Robin eagerly expected to become a member of the Justice League, alongside Speedy, Aqualad, and Kid Flash. However, when it became clear that that wasn't happening, he, Aqualad and Kid Flash went to investigate Cadmus Labs. There, they discovered the Genomorph project and Superboy, whom they liberated. The four youths stood up to their mentors and declared they were ready to prove themselves as heroes. They formed a covert ops team and were given their own headquarters in Mount Justice by Batman in the shape of a T letter.

The team would later recieve new aditions, Grayson peaking interest in two of them, Zatanna Zatara and Rachel Ervin. At some point, Garfield Logan would also join the Team due to his freindship with Megan Morse. Grayson would discover there was a mole working for a conspiracy group called The Light, which would later be revealed to be an unwilling Arsenal, Green Arrow´s partner. Grayson and his teamates managed to stand up against a brainwashed Justice League, freeing them from the Light´s control.

At the age of 15, he and the Team met with the half robotic athlete Victor Stone, whom used the alias Cyborg, and the mysterious yet powerful Rachel Roth, whom used the alias Raven, in an attempt to battle the Alien Gordanians, rescuing the Tamaranian Princess Koriand'r, who became the team member Starfire. Shortly after that, they would oftenly be troubled by Gizmo, Jynx and Mammoth, whom claimed they were sent by a man codenamed Deathstroke.

Robin would attempt to use the faux identity of Red X to infiltrate Deathstroke ranks and gain info about him, sadly, Deathstroke seemed to figure this out and planned to keep Grayson as an apprentice, an offer he refused. While at first thinking he overpowered Deathstroke, it was later revealed it was a robot in disguise, leading the Titans back to square one.

To ensure he could have Grayson as apprentice, Deathstroke, revealing his name to be Slade Wilson, he injected the Titans with nanomachines that would made them explode in a button press if he didnt complied, while this at first seemed to work, Grayson injected himself with such nanobots, thus if Slade pushed the button, he would also be deprived of his apprentice. Cybord would later cure the titans with his experience on robotics from their status.

Tara Markov, alias Terra, would later join the Teen Titans for a while, but then it would be revealed she was the person whom Slade made her apprentice. While Slade and Terra almost eliminated the titans, Terra, due to befriending Garfield Logan, used his power to activate a dormant volcano, sending herself and presumbly Slade to their deaths. This would cause heavy repercussions on Robin, as he would be paranoic with Slade´s return that in a battle with Scarecrow, he would end up seeing ilusions of Slade, though with the help of his friends he would realize this was an ilusion and was able to fight it off.

Other notorious adventures that Robin had with the Teen Titans involved managing to stop a crime school named H.I.V.E. led by Brother Blood (rumored to have affiliations with the society known as The Light) and preventing an Apocalypse triggered by Raven´s father Trigon, during this last adventure, is where Slade resurfaced back. At a point the titans would be captured by a member of The Light known as The Brain, but Beast Boy, along with new teamates (Mas, Menos, Herald, Pantha and Jericho) managed to rescue them, Robin freezing the Brain and his cohorts (albeit Lex Luthor would use his position to recover them later)

Nightwing
After graduating from college, Dick traveled the globe studying from various martial arts and crime fighting techniques. After a few years of world traveling and training, Dick returned to Gotham City. Due to Grayson being lately more interested in making himself a more independent hero from Batman, Bruce Wayne had another sidekick, Jason Todd (alias Red Robin), whom he saw as a little brother, sadly, he would perish in a battle against the Joker. A kid named Tim Drake would eventually deduce his and Batman´s identity and tried to convince them to work together again, while at first not suceeding, Drake took the mantle of Robin and teamed up with Batman. Much like with the previous two Robins, Wayne adopted Drake.

During a patrol with Tim Drake and Batman, Nightwing revisited his circus roots. While doing so, he and Batman discovered that Mad Hatter is controlling the animals in a series of otherwise inexplicable robberies. Nightwing eventually partly reconciled with his former mentor and partner after an experience with the second Robin, whom he became closer since then and worked on the Bat-Team for a while longer.

Nightwing served on the team known as Young Justice (the name being changed due to the people on it not being teens anymore) as their leader and trainer, assigning and participating in missions. Dick encouraged Tim to have confidence in his leadership skills, but the latter was apprehensive about doing so. After Wally West sacrificed himself to save the world, Dick took a leave of abscence from the team and left Barbara Gordon in charge. Years later, he became the leader of his own team alongside Oracle, recruiting Black Lightning, Superboy, and Tigress. At the same time, he was a member of a sort of Anti-Light, a group formed to use The Light's own methods against them.

(Credit to Bestman902 for S2 and S3 paragraph about Young Justice)

(Credit to Injustice Lord for Review of this Bio)