Croc

Waylon Jones, better known as Croc, is a high-profile criminal and one of Batman's most challenging adversaries. Croc is best known for his reptilian appearance, which is due to his medical condition. In his early appearances, this manifested as tough, crocodile-like skin, but over the years, he has slowly taken on more crocodilian features, essentially becoming an anthropomorphic reptile. (You can be whoever you wish and have whatever kind of bond you wish with Croc, within reason; otherwise, enjoy - Grimm)