King Fisher is a Deadman previously imprisoned in Deadman Wonderland. King Fisher was his codename, his real name hasn't been revealed yet.
King Fisher was mentioned when Scar Chain's first prison break attempt failed and they were thinking about recruiting new members. Endo suggested King Fisher, but Karako said that he is out of the question, because he died during a Penalty Game. Endo later commented that he was a good guy.