My "realistic" version of Killer Croc.
I'm really not fond of the newer versions of Croc where he looks so reptilian. I like it that so many of the Batman villains are at least somewhat feasible in the real world. For my version I wanted him to look a bit more generally creepy. I was thinking of him more as a guy who has a skin disorder that makes him look a bit like a crocodile. After years of ridicule and abuse for his appearance, he finally embraces his disorder. As a result he starts to mutilate himself (cutting off his nose, filing and capping his teeth, removing the skin on his cheeks, contact lenses, etc).
This version wouldn't have quite as many powers as modern comic version. But I figure if his skin disorder toughens his skin and deadens pain, he devotes himself to fighting skills, and he's generally psychotic, he would still make a pretty formidable opponent!