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.
Dick Grayson
Dick Grayson has taken on the identity of Batman on a few occasions. In the aftermath of "", Grayson initially declines taking up the mantle of Batman while the original was recovering from a broken back as he feels Nightwing is a hero in his own right and not Batman's understudy, but after the events of the "Zero Hour" miniseries later that year, he replaces Bruce Wayne as Batman, beginning in "Robin" #0 (1994) and extending throughout the "" storyline in 1995. Dick again assumes the mantle following the events of "Batman R.I.P." (2008) and "Final Crisis" (2008–2009). As Batman, Dick moves to Gotham City following his mentor's apparent death and partners with the fifth Robin, Damian Wayne. On Bruce's return, both men maintained the Batman identity until 2011, when Dick returned to the Nightwing identity with DC's The New 52 continuity reboot. In a 2014 comic story, Dick is forced to abandon the Nightwing identity after being unmasked on TV and faking his death, setting up Tim Seeley's "Grayson" comic book, Dick becomes Agent 37, Batman's mole in the nefarious spy organization Spyral. Following the conclusion of the "Grayson" series, and the restoration of his secret identity in the series' final issue, Dick returns to being Nightwing as part of the DC Rebirth relaunch in 2016.