Robin

Dick Grayson in his original Nightwing costume. From Tales of the Teen Titans #59 (November 1985).

In pre-Crisis on Infinite Earths continuity, the maturing Dick Grayson grows weary of his role as Batman's young sidekick. He renames himself Nightwing, recalling his adventure in the Kryptonian city of Kandor, where he and Batman meet the local hero of the same name.

Nightwing: Secret Files & Origins #1 and Nightwing: Year One tell the full post-Crisis version of how Dick Grayson gives up his identity as Robin (having been "fired" by Batman). Uncertain what to do with his new-found independence,...