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.
Alternative versions of Barbara Gordon
Barbara Gordon appears in the fifth issue of the comic book continuation of the television series "Smallville". In "Smallville Season Eleven," she is Nightwing in this continuity instead of Batgirl or Oracle. She does however, joke about her mainstream code name, stating that she chose Nightwing instead because she hated how Batgirl sounded. She later introduces her boyfriend Richard "Dick" Grayson to Batman as her replacement after she is selected to be a Blue Lantern. It is also implied that, prior to becoming Batman's partner as Nightwing, she dressed in a female version of her mentor's costume at a costume ball, a nod to the original character.