Shark is a name used by several characters in the DC Universe.
Gunther Hardwicke was an inventor who wanted to do something else, so he became a criminal. With his friends Fox and Vulture, he committed crimes as the Terrible Trio, and frequently opposed Batman. Karshon was a normal tiger shark until a radioactive spill super-evolved him into an anthropomorphic shark. He became an enemy of Green Lantern.
Gunther Hardwicke was created by Dave Wood and Sheldon Moldoff, and first appeared in Detective Comics #253 (1958). Karshon was created by Gil Kane and John Broome, and first appeared in Green Lantern (Volume 2) #24 (1963).
Several other villains have used a variation of the name "Shark", including Killer Shark, King Shark, Black Shark, Great White Shark, Carcharo and Tiger Shark.
Multiverse
The New 52
Pre-Crisis
Elseworlds
Alternate Timelines
Sports Teams
Other Media
See Also