Jim Cook  

Crocodile, ジム・クロコダイル・クック

Jim is an expert geologist and archaeologist with experience excavating a Tyrannosaurus. He has a crocodile named Karen, who was initially thought to be fake by Vellian Crowler and Bonaparte but is considered "family" by Jim and not a pet. Jim trusts Karen greatly and uses her as a judge of good character, which led to his friendship with Judai Yuki. He wields a Duel Disk in the shape of a boomerang. While saving Karen from an animal trap, he injures his right eye. After regaining consciousness, he is imbued with the Eye of Orichalcum by a man touched by Jim's devotion to Karen. The man claims that it has incredible powers when in the presence of a special comet. Since then, Jim keeps his right eye bandaged.