Nightwing
Although Nightwing is commonly associated with Batman, the title and concept have origins in classic Superman stories. The original Nightwing in DC Comics was an identity assumed by alien superhero Superman when stranded on the Kryptonian city of Kandor with his pal Jimmy Olsen. Drawing inspiration from Batman and Robin, the two protect Kandor as the superheroes Nightwing and Flamebird. Following the Crisis on Infinite Earths continuity reboot in 1985, Nightwing was re-imagined as a legendary vigilante from Krypton whose story inspires Dick Grayson's choice of name when he leaves behind his Robin identity.
Dick Grayson
Starting with the "DC Rebirth" relaunch in 2016, Dick returned to being Nightwing with his black and blue costume, his Spyral contacts having wiped all global evidence of his dual identity and the bomb removed from Damian. He uses his new skills and expertise in espionage moving forward. Nightwing is featured in two Rebirth books: the fourth volume of "Nightwing", his own solo book, and "Titans", where Dick teams up with the other original "Teen Titans" after Wally West returns to the universe; through Wally, Dick remembers events of his life prior to "Flashpoint" and "The New 52". After the Titans are forcibly disbanded by the Justice League, Dick creates a new Titans team after the rupture of the Source Wall consisting of Donna Troy, Raven, Steel (Natasha Irons), Beast Boy, and Miss Martian.