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.
New Earth
(Other Versions)
Multiverse
The New 52
Earth 66
Batman '66
Pre-Crisis
Earth-Two
Wonder Woman Villain
Elseworlds
Elseworlds
No Rules to Follow
Scooby-Doo
The Batman & Scooby-Doo Mysteries
Alternate Timelines
Sports Teams
Arrowverse
Football
Other Media
See Also