Nightwing
Nightwing is a fictional superhero appearing in American comic books published by DC Comics. The character has appeared in various incarnations, with the Nightwing identity most prominently being adopted by Dick Grayson when he moved on from his role as Batman's vigilante partner Robin.
Flamebird
While in Kandor, Nightwing and Flamebird met Van-Zee, a Kandorian scientist who looked strikingly similar to Superman. At one point, Van-Zee himself donned the Nightwing costume in order to rescue a captured Superman. After Superman and Jimmy's departure from Kandor, Van-Zee took up the role of Nightwing full-time.