Killer Croc, Aka Waylon Jones is a character created in 1983 to add to Batman's rogues' gallery. He has a rare disorder responsible for his condition aided by a kind of metagene; this allows him very tough skin, incredible strength and a keen sense of smell among others. In most comics, he is taller than the average person, but in the Arkham game series, he is MASSIVE, standing at about 11 feet tall. To add to that, in Arkham Knight's Most Wanted DLC, he is experimented on to further exaggerate his reptilian traits to make him even more monstrous and crocodile-like.
The Arkham games also make him far more cannibalistic and vicious (not that he ever wasn't these things per se). He sports teeth that grow beyond his mouth, a massive frame, and has is basically singularly focused on eating and killing. He must use money for something though because in Arkham Origins he is part of the 8 assassins that seek to collect 50 million dollars for Batman's head.
This figure is the craziest, largest 7-inch scale figure I own and unless I get Clayface, Solomon Grundy or Titan Joker, likely the largest I will ever own. He is glorious.