The Creature King
Nemesis: Martian Manhunter
Other Major Foes: None.
Appearances: One comic story
Powers: Giant-sized; super-strength & durability; animate and command stone statues; explosions triggered when struck.
The Creature King was a stone colossus brought to life by the Diabolu-Head who paid it forward by creating an army out of a menagerie of statues. Was tricked into defeating itself by J'onn J'onzz.
Win: Aroo (4-1), The Chulko (5-2*), The Color-Ring Creature (3-1), The Orchestra of Doom (4-0), The Venomee (5-1*)
Other Major Foes: Aqualad
Appearances: 3 comics.
Powers: Giant-sized; super-strength and durability.
Bio: A diver working under an alias who tricked Aquaman & Aqualad into helping him recover a sunken treasure. A potion allowed him to claim the supposed birthright of his ancient race to become a twenty foot purple beast that ripped booty out of ship hulls and swatted whales away.
The Creature King of the Sea may have come first, but The Creature King of the Vile Menagerie comes hardest. Iwangis has a wider variety of powers, and greater defensive strength, so he's most likely to blow his competition out of the water.