A B O U T
...just tell me everything you know.
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WARNING: UNMARKED SPOILERS are ahead! Your best bet is to skip reading this information if you do not wish to be spoiled. Everything here was written by me, and every picture was edited and resized by me as well. Please do not reuse anything on this page as it's meant for this fanlisting only.
Jim Crocodile Cook is an Australian exchange student from South Academy who enters the series, Yu-Gi-Oh! GX, during the third season. He is one of the four champion duelists from Duel Academy's worldwide branches. He's extremely smart, being both a geologist and archaeologist, and participated in a Tyrannosaurus excavation in the past. When entering the school, he gives many people a scare. This is because he carries around a live crocodile named Karen. Jim doesn't consider Karen a pet, though. Instead, he calls her his family. 
All and all, he's an extremely kind person who stands by his friends no matter what. Thus explaining why many people, such as Judai and Kenzan, befriend him during the series. As far as dueling goes, Jim duels with a Fossil Dragon Deck and uses a Duel Disk in the shape of a boomerang.
Anime Spoilers Season Three, Part One: Disclosure Duels Due to Professor Cobra's strange hidden lab, electromagnetic waves channel through Duel Academy island causing Karen to act strange. Because of this, Jim decides to investigate these odd waves with the help of Judai Yuki, Johan Andersen, Sho Marufuji, and Tyranno Kenzan. Jim ends up dueling Tyranno Kenzan in episode 110 from those electromagnetic waves messing with the Ra Yellow teen's dinosaur DNA that is inplanted in his leg. Through-out the duel, Jim nicknames Kenzan "dino-boy." They become friends by the end of it, with both of them smiling while unconcious on the ground. Season Three, Part Two: Zombie Academy During this part, Johan gets left behind in the mysterious world Duel Academy had been transfered to. This leads to some major events in the next arch. (Sorry, I don't want to write a lot about this one!) Season Three, Part Three: The Dark World This part of the season has been my favorite by far. Now for more spoilers. It is during this part we learn more about Jim and partly about his past. Judai, whom is saddened by the fact that Johan was left behind, ventures back to the strange world in high hopes of bringing him back safely. Jim and the others follow after him, willing to help him out. In this world, you lose a duel you die. At one point, Kenzan, Asuka, Fubuki and Manjyome all are killed and used as sacrafices to create a certain card before Judai was able to win. Before dying, they all tell him he's selfish and only dueled for himself. 
Filled with deep sorrow, Judai gives up on his precious friends and is later possessed by the Supreme King of this world. He becomes evil and goes off gathering souls of duelists. (Okay, I'm going to skip some events simply because this IS a Jim fanlisting. Let's not get too into everyone else.) Jim later challenges Supreme King Judai to a duel. It is revealed that he lost his right eye in his childhood. Karen was about to go right into a trap, so Jim jumped at her, pushing her out of the way and falling from a cliff into a river. 
When he awakes, a mysterious old man is sitting by him. He tells Jim that in place of his right eye is an artifact known as the "Orichalcum Eye" and that with its help, he can make a miracle whenever he wanted to save a friend. Jim's bandages over his eye get burned off from an attack during the duel, and the eye is revealed. Jim believes he can free Judai with this remembering what the old man had told him. Although Jim loses the duel, (he technically should have won since the script writers of GX made a mathematical error) the eye falls into the hands of O'brien. 
Later, when O'brien finally gets out of his cowardly state after seeing Jim "die" before his eyes, he goes to duel Judai. During the duel, Jim's spirit appears by O'brien's side, and they draw the final card he needed to free Judai together. O'brien lunges at Judai, pushing the Orichalcum Eye into him. In Judai's heart "room," the eye floats around him and Jim appears. He tells him to come back, that everyone's waiting, and there's no longer a reason to have darkness in his heart. Judai says nothing, faints into Jim's arm, and they both fade from the room together. O'brien ends up "dying" due to the duel ending in a tie, but Judai is back to normal in the other world now thanks to Jim and O'brien's efforts. Season Four, Part one 
Finally after all the chaos and fighting, everyone has returned home to the real world -- everyone except a few un-named people, that is. (Sorry, I won't spoil that part here!) Unfortunately, this is where Jim's story comes to an end, and the Australian makes a brief appearence in the beginning of this season to bid farewell to everyone at Duel Academy on the ship departing home. Despite his parting here, he'll always be, to me, an excellent character from GX. Heck, without his struggle, no one would've returned home more than likely!
Other Self The manga is a completely different storyline than the anime, just with the same awesome characters plus some new ones. A major thing that should be pointed out, is that all the exchange students are from the American Duel Academy, whereas in the anime they were from different branches around the world. In the manga version, Jim is referred to by his full name "James." The Jim of the manga isn't the Jim of the anime. As it turns out, he is seemingly possessed by Tragoedia, the main antagonist of the GX manga that also possessed the American academy's principal among other duelists. Thus in the comics he's an antagonist too! (Gasp!) As far as duels go, at one point he seeks out Fubuki, catching him in the forest near the old abandoned dorm, then challenges him to a duel. However, Fubuki wins this duel. During Jim's later tag-team match with O'brien vs. Manjome and Sho, both he and O'brien share a loss -- and both Jim and O'brien don't seem too happy about it. Out of the five exchange students (Johan, Jim, Amon, O'brien, and Edo), Johan seems to be the only carefree one despite how so far all of them but Edo have lost their duels. This is a surprising fact given that Jim's anime version was not only a good guy, but quite the cheery one at that. At this point it is unclear whether or not this could be because of Tragoedia's control over him. In the manga, Jim duels with an Alligator-themed Reptile Deck, and it appears thus far that he doesn't have Karen with him.