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.
Nightwing
With a defenseless city to call his own, Nightwing decides to remain in Blüdhaven until Blockbuster's cartel is broken. This allows him to be close enough to Gotham to still be part of the Batman family, and far enough as well to have his own city, adventures and enemies. He takes a job as a bartender to keep his ear to the ground and worked closely with Oracle (Barbara Gordon) in an effort to clean up the town. Blockbuster places a sizable contract on Nightwing's head shortly thereafter, while Grayson plies the unscrupulous Blüdhaven Police Inspector Dudley Soames for information on the kingpin's dealings. Also during his time in Blüdhaven, Nightwing helps train a violent but enthusiastic street fighter called Nite-wing, who later kills an undercover FBI agent.