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
In Blüdhaven, a sociopath named Tad Ryerstad becomes a superhero, inspired by the retired hero Tarantula. He takes his name, "Nite-Wing", from an all-night deli specializing in chicken wings. Unstable, Nite-Wing beats people for minor offenses. Nite-Wing is shot on his first night out and Dick Grayson, as Blüdhaven's protector Nightwing, defends him from Blockbuster's gang, who think it is Nightwing who has been injured. After Nite-Wing is released from the hospital, he kills the gang who put him there. Not realizing how violent Ryerstad is, Grayson agrees to train him. The two attack Blockbuster's organization, but are captured and separated. After an undercover FBI agent frees Nite-Wing, Ryerstad beats him to death, and when he realizes what he has done, Ryerstad flees. Nightwing subsequently tracks down and incarcerates Nite-Wing. In prison, Ryerstad is cell-mates with Torque (Dudley Soames), but the two escape by drugging the prison guard Amygdala.