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.
Lady Shiva
In The New 52 (a 2011 reboot of the DC Comics universe), Lady Shiva appears in "Nightwing" #0. After she defeats Batman, Dick Grayson fights her in his debut as Robin with a costume composed of spare Bat costume parts. Lady Shiva easily defeats him and encourages him to stop living in Batman's shadow. In issue #13, she returns to Gotham City several years later to kill another target and Dick Grayson as Nightwing sets out to stop her.