JACK

Jack, sometimes capitalized as JACK, is the name of a series of robots that are upgraded in each main installment in the Tekken series of fighting games. There has been a playable Jack model in every main Tekken game except for Tekken 4. Prototype Jack is seen as separate to the main line.
== Biography ==
The Jack robot series was partly created by Dr. Boskonovitch. The original Jack robot appeared in Tekken 1, Jack-2 is from Tekken 2, Jack-3 is considered to be Gun Jack, Jack-4 was never playable in a game but can be seen in the Tekken 5intro, Jack-5 made his return as a playable character in Tekken 5, Jack-6 appears in Tekken 6 and Tekken Tag 2, and Jack-7 appears in Tekken 7. P. Jack is an earlier prototype of the Jack robot series and was originally created to combat Jack-1 and Jack-2. Although non-canon, "Jack-X" (most closely based on Jack-6) appears in the crossover, Street Fighter X Tekken. 
The original military cyborg Jack was developed as a shock weapon. In Tekken, Jack's handlers sent him to the tournament to get rid of Kazuya when they got wind of his plans for a world coup d'etat. Nothing but a robot could boast his violent attacks and stupendous power.
In Tekken 3, Jack-2 is "reborn". When Jane, now a physicist, was eight years old, she was rescued from a bacteriological war by the Russian military robot Jack-2. However, Jack-2 was later destroyed by a satellite weapon as Jane, still a young girl, watched in horror. Jane, now 27, could not forget the nightmare of Jack-2 having collapsed beside her. She spent 10 years restoring Jack-2 to 90% functionality, but it seemed to have lost the human characteristics that set it apart from Jack. Jane worked hard analyzing the program in order to return to Jack-2 the gentle soul which had saved her life. Through detailed analysis, she found that most of Jack-2's programming was created by Mishima Industries, one of the subsidiaries of the Mishima Zaibatsu. Moreover, she discovered a hidden program... 'Project Gun Jack'. It laid the groundwork for a new weapon, a pivot gun. In order to restore Jack-2 completely, Jane had to approach the Mishima Zaibatsu and solve the mystery of the project. She quickly installed the hidden program and brought the newly dubbed Gun Jack to the Mishima Zaibatsu.
Two years before Tekken 5, a physics scientist named Jane tried to sneak into Mishima Industries with Gun Jack. However, they were discovered by a Tekken Force patrol and were fired upon. Gun Jack placed himself in the line of fire to protect Jane. After the hail of bullets stopped, Gun Jack had ceased to move. The day after, Jane was found and rescued by a G Corporation freighter. Jane joined the robotics division of G Corporation and successfully created Jack-4. Jane used data collected from Jack-4 and began work on a newer model, Jack-5. She saw the upcoming King of Iron Fist Tournament as the perfect chance to test the latest model, equipped with state-of-the-art technology.
Returning to have his emotion program installed, Jane downloads Gun Jack's memories into Jack-5, but the results cause him to go berserk, ripping free and trashing the lab. As he brings down his arms in a crushing blow on Jane, the memories re-assert themselves and Jack stops, looking over his body in confusion. Jane goes to him and he picks her up in his arms gently, his original personality fully restored.
After Jack-5 had returned from collecting combat data at the King of Iron Fist Tournament 5, it returned to G Corporation's laboratory where Jane proceeded to run advanced combat algorithms based on its research. Soon afterwards, war between the Mishima Financial Group and G Corporation broke out. And just as large numbers of production model Jacks were being dispatched to all parts of the world, unconfirmed reports stated that the Mishima Financial Group had drawn up plans of their own to imitate the killer robots. The audacity of someone coping her Jack angered Jane greatly; thus, she sent Jack-6, the newest Jack, to investigate the incoming reports.
== Personality ==
Having been built as a destructive killing machine, Jack robots are generally very aggressive and do not hesitate to destroy everything in sight. 
However, at least one Jack robots was able to show empathy and compassion, as demonstrated by Jack-2's reaction to finding Jane. They also seem to possess the capacity to be very protective of those with whom they share a close bond, even going so far as to sacrifice themselves, as demonstrated by Gun Jack in his Tekken 3 storyline. 
Jack-6's personality is explored when playing as him in the Scenario Campaign in Tekken 6, where he is vocal of his love of fighting, strong opponents, and fellow robots. While he is programmed to understand longer words like "biologicals" (his name for humans), he generally has a very child-like way of thinking and speaking, failing to understand a lot of what the other fighters are saying to him, and labeling anything unknown or unfamiliar as "bad".
== Appearance ==
The Jack robots, throughout their many incarnations, have maintained the same general appearance - humanoid juggernauts with bulging muscles. While earlier models looked relatively human, the later models have sectionalized skin, making them appear less human. This is especially apparent in the Jack-7 model, where a green glow radiates from the joins in his skin. The most recognizable feature of Jack robots, however, is the distinctive head and face, complete with trademark Mohawk hairstyle, shared by all models of Jack robots.
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