Nightwing by ProfessorAdagio
Please note, the image above is the result of my fan edit/manipulation which is my attempt at making the image have a different look and feel to the original. The original work can be found in the link below.
Nightwing is first depicted in the story "Superman in Kandor" in Superman (vol. 1) #158 (January 1963). It is an alias used by Superman in pre-Crisis adventures written by Edmond Hamilton. These stories are set in the city of Kandor, a Kryptonian city that was shrunken and preserved in a bottle. In Kandor, Superman has no superpowers; in the story, he is branded an outlaw there due to a misunderstanding. To disguise themselves, Superman and Jimmy Olsen create vigilante identities inspired by Batman and Robin. Because neither bats nor robins lived on Krypton, Superman chooses the names of two birds owned by his Kandorian friend Nor-Kan: "Nightwing" for himself and costumes evocative of the birds' plumage, and Flamebird for Jimmy. Nightwing and Flamebird rename Nor-Kan's underground laboratory as the "Nightcave", and use it as their secret headquarters. They also convert Nor-Kan's automobile into their "Nightmobile", and use "jet-belts" to fly into battle.
In Jimmy Olsen #69 (June 1963), "The Dynamic Duo of Kandor" introduces Nightwing's dog Nighthound. In "The Feud Between Batman and Superman" in World's Finest #143 (August 1964), Batman and Robin themselves visit Kandor with Superman and Olsen and the two Dynamic Duos team up. He also has his own video game.