Joseph Gordon-Levitt plays 'hot-headed' police officer John Blake in The Dark Knight Rises.
What, if any, comic book characters is this character based on?
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Having just watched the movie earlier today, I think John Blake's character draws together bits & pieces from the three main Robins - Dick Grayson, Jason Todd, and Tim Drake.
The cop part comes from Dick, who becomes a police officer in Blüdhaven after becoming Nightwing and was, of course, the original Robin. The hard-luck, orphaned origin and self-professed anger issues I think are mostly from Jason Todd. His deduction of Bruce Wayne/Batman's true identity comes from Tim Drake, who figures this out as a boy.
There’s been one appearance of a "John Blake" in the comics, but only as a kid who gets his report card stolen by the Joker in an early Batman strip, Jack Schiff's 'A Comedy of Tears' (Batman #13, 1942), later recreated for the 256 Pages Super Heroes Coloring Book. (source)