Jim Crocodile Cook

Jim Crocodile Cook (ジム・クロコダイル・クック Jimu Kurokodairu Kukku) is a fictional character in the anime series Yu-Gi-Oh! GX (Yu-Gi-Oh! Duel Monsters GX in Japan).

Fictional character biography
Jim Crocodile Cook is a new student hailing from South Academy (South School) who enters Duel Academy (Duel Academia) in the third year. He is an expert Geologist and archaeologist, having taken part in an excavation of a Tyrannosaurus in the past, and has a crocodile named Shirley, initially believed to be a fake by Vellian Crowler and Bonaparte, who he carries around in a specially made backpack wherever he goes. Jim regards Karen as "family," and does not consider her a pet. He wields a Duel Disk in the shape of a boomerang. In the Japanese version, he speaks frequently in English and gives nicknames to his companions such as "Dino Boy" and "Tomorrow Girl" for Tyranno Hassleberry (Tyranno Kenzan) and Alexis Rhodes (Asuka Tenjouin), respectively.

During the duel between Jaden Yuki (Judai Yuki) and Austin O'Brien, Karen began acting strangely due to electromagnetic waves coming from within the jungle. Meeting up with Jaden and his friends after Karen inadvertently attacks Tyranno Hassleberry (Tyranno Kenzan) the next day, he and the group venture deep into the woods to investigate. Seeing another opportunity to claim duel energy, Professor Viper reactivates the signals, causing Tyranno to act wildly and face Jim in a Dis-Duel. Although the duelist quickly regains his senses, he lashes out at Jim for disturbing his dinosaur monsters, but is eventually defeated.

Deck
Jim plays a Fossil deck. His strategy relies heavily on the use of Fossil Fusion to remove from the game the monsters in both his own and his opponent's Graveyards to summon creatures of varying strengths dependent on the levels and types of the Fusion Materials used for the merger. The monsters created by Fossil Fusion follow "reverse evolution" through the Cenozoic, Mesozoic, and Paleozoic Eras; the more ancient the monster, the more powerful it is.