Waylon Jones, usually called Killer Croc, is a criminal. He's nine feet tall and weighs 310 pounds, making him massive. Was born with a rare genetic disorder called epidermylitic hyperkeritosis, a condition that causes the skin to thicken and flake off in a pattern resembling reptile scales. He looks somewhat like a reptile, or a crocodile, hence his name, even though he lacks a tail. He has yellow eyes. He doesn't work for anyone specifically, just doing what is most convenient for him. Despite his role as a criminal, and his numerous past crimes, Waylon is not really evil, and is probably the least malicious of Batman's rogues. He commits violence in self defense, and just wants to be left alone. Batman respects this, and is probably the only one that does, but won't hesitate to apprehend him if his actions go to far.