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Keisuke Jin (神敬介 Jin Keisuke) is Kamen Rider X (仮面ライダーX Kamen Raidā Ekkusu, Masked Rider X), the primary protagonist and eponymous character of the 1974 Kamen Rider Series Kamen Rider X. His design was based on a mechanical grasshopper and the letter X. He is also known as X-Rider (Xライダー Ekkusu Raidā) and is the fifth Rider after Riderman.

Originally a firey and serious young man, Keisuke argued with his father from time to time despite their love and respect for one another, to the point where he was called out for it by his (at the time) girlfriend. His life was turned upside down, however, when he suffered horrible injuries and was altered into a Kaizorg. At first, Keisuke was horribly distraught by his cyborg body as well as being betrayed by his former girlfriend and suffered greatly. He suffered even more when the machine which held his father's personality and memories self-destructed when it felt that Keisuke had become too dependent on it, thus leaving Keisuke alone to fight his father's murderers. Despite all these incidents, Keisuke continued to fight G.O.D. to protect humanity. Eventually, Keisuke slowly regained his former cheerfulness, while facing more hardships in his life which made him stronger. He also decided to trust his former girlfriend when convinced by her sister Kiriko and was mournful when they both died. Although told by Kiriko to lose his feelings and become the X-Rider, Keisuke did not lose his humanity and kept the feelings and emotions he felt. It was because of these feelings that Keisuke did not lose hope as he tried to save people from suffering as he did. His aggressive determination remained even as he steadily matured over the course of his battles.

Keisuke was the son of Robotics scientist Keitarō Jin who was devising the technology for undersea exploration. However, Keisuke and his father were attacked by Neptune of the G.O.D. organization which wanted the technology for their use, and his fiance Ryoko Mizuki seemingly betrayed the two of them for G.O.D. As a result, Keisuke suffered mortal injuries inflicted from the ordeal, being shot repeatedly by G.O.D. combat agents and left to die, forcing his father to perform cyborg reconstruction surgery on his son with what little of his inventions to make his son into a "Kaizorg" (カイゾーグ Kaizōgu) to save his life before he succumbed to his own injuries. Driven to avenge his father's death and save the world, Keisuke battled G.O.D. His early conflict led to several encounters with Ryoko, never able to find the reason for her sudden betrayal, while also being provided cryptic guidance from a woman named Kiriko, who looked identical to Ryoko. During his fight with Mighty Atlas, Kiriko was mortally wounded and revealed that she was Ryoko's twin to Keisuke before dying. Keisuke's anguish only escalated when Ryoko herself died upon betraying Atlas, revealing that she had been working as an undercover INTERPOL officer who underwent cyborg surgery to spy on G.O.D. before being killed by a self-destruct device implanted within her by G.O.D.

After this, Keisuke's battle continued as Apollogeist, Chief of G.O.D's Secret Police, clashed with him repeatedly. Even after seemingly killing Apollogeist, his resurrection, and upgrades forced X to continue training until their eventual final showdown, destroying his adversary once and for all. His victory was short-lived, however, as King Dark soon made his presence known to the X-Rider.

Sometime later, X was captured and had his energy absorbed by G.O.D.'s villain monster Spider-Napoleon. At the last moment, V3 appeared and challenged him to a battle, only to disappear, escaping with X. Keisuke Jin's life was in danger, and his power wasn't enough to face his opponent, to help the fellow Rider, V3 decided to give him the Mercury Circuit (マーキュリー回路), which could greatly power up X. However, V3 needed to transfer a large amount of his blood to him in the process, weakening himself. Spider-Napoleon soon attacked again, forcing V3 into action before he had recovered. V3 managed to rescue his hostages but was overwhelmed by Spider-Napoleon and the rebuilt Mach Achilles and Salamander-Gong. He was rescued by the powered-up X, who finished off Spider-Napoleon, while V3, even weakened, beat Mach Achilles and Salamander-Gong together. After being further assisted by Shiro and later Hayato Ichimonji in defeating Tiger Nero, Keisuke confronted King Dark, head of G.O.D's Villain Army, alone. In a dramatic struggle against this gigantic foe, Keisuke allowed himself to be "eaten" by King Dark, infiltrating its innards to discover the true mastermind of the organization, Dr. Noroi, a former friend of his own father. Despite being impaled through the chest by a spear from Scorpion-Geronimo Jr., Keisuke killed Noroi and Jr., obliterating King Dark in the process. Having miraculously survived, he left his comrades to seek out the other Riders and to continue growing, leaving behind a note to Tachibana in which he promised that he would return someday.

Description
Keisuke Jin (神敬介 Jin Keisuke) is Kamen Rider X (仮面ライダーX Kamen Raidā Ekkusu, Masked Rider X), the primary protagonist and eponymous character of the 1974 Kamen Rider Series Kamen Rider X. His design was based on a mechanical grasshopper and the letter X. He is also known as X-Rider (Xライダー Ekkusu Raidā) and is the fifth Rider after Riderman.

Originally a firey and serious young man, Keisuke argued with his father from time to time despite their love and respect for one another, to the point where he was called out for it by his (at the time) girlfriend. His life was turned upside down, however, when he suffered horrible injuries and was altered into a Kaizorg. At first, Keisuke was horribly distraught by his cyborg body as well as being betrayed by his former girlfriend and suffered greatly. He suffered even more when the machine which held his father's personality and memories self-destructed when it felt that Keisuke had become too dependent on it, thus leaving Keisuke alone to fight his father's murderers. Despite all these incidents, Keisuke continued to fight G.O.D. to protect humanity. Eventually, Keisuke slowly regained his former cheerfulness, while facing more hardships in his life which made him stronger. He also decided to trust his former girlfriend when convinced by her sister Kiriko and was mournful when they both died. Although told by Kiriko to lose his feelings and become the X-Rider, Keisuke did not lose his humanity and kept the feelings and emotions he felt. It was because of these feelings that Keisuke did not lose hope as he tried to save people from suffering as he did. His aggressive determination remained even as he steadily matured over the course of his battles.

Keisuke was the son of Robotics scientist Keitarō Jin who was devising the technology for undersea exploration. However, Keisuke and his father were attacked by Neptune of the G.O.D. organization which wanted the technology for their use, and his fiance Ryoko Mizuki seemingly betrayed the two of them for G.O.D. As a result, Keisuke suffered mortal injuries inflicted from the ordeal, being shot repeatedly by G.O.D. combat agents and left to die, forcing his father to perform cyborg reconstruction surgery on his son with what little of his inventions to make his son into a "Kaizorg" (カイゾーグ Kaizōgu) to save his life before he succumbed to his own injuries. Driven to avenge his father's death and save the world, Keisuke battled G.O.D. His early conflict led to several encounters with Ryoko, never able to find the reason for her sudden betrayal, while also being provided cryptic guidance from a woman named Kiriko, who looked identical to Ryoko. During his fight with Mighty Atlas, Kiriko was mortally wounded and revealed that she was Ryoko's twin to Keisuke before dying. Keisuke's anguish only escalated when Ryoko herself died upon betraying Atlas, revealing that she had been working as an undercover INTERPOL officer who underwent cyborg surgery to spy on G.O.D. before being killed by a self-destruct device implanted within her by G.O.D.

After this, Keisuke's battle continued as Apollogeist, Chief of G.O.D's Secret Police, clashed with him repeatedly. Even after seemingly killing Apollogeist, his resurrection, and upgrades forced X to continue training until their eventual final showdown, destroying his adversary once and for all. His victory was short-lived, however, as King Dark soon made his presence known to the X-Rider.

Sometime later, X was captured and had his energy absorbed by G.O.D.'s villain monster Spider-Napoleon. At the last moment, V3 appeared and challenged him to a battle, only to disappear, escaping with X. Keisuke Jin's life was in danger, and his power wasn't enough to face his opponent, to help the fellow Rider, V3 decided to give him the Mercury Circuit (マーキュリー回路), which could greatly power up X. However, V3 needed to transfer a large amount of his blood to him in the process, weakening himself. Spider-Napoleon soon attacked again, forcing V3 into action before he had recovered. V3 managed to rescue his hostages but was overwhelmed by Spider-Napoleon and the rebuilt Mach Achilles and Salamander-Gong. He was rescued by the powered-up X, who finished off Spider-Napoleon, while V3, even weakened, beat Mach Achilles and Salamander-Gong together. After being further assisted by Shiro and later Hayato Ichimonji in defeating Tiger Nero, Keisuke confronted King Dark, head of G.O.D's Villain Army, alone. In a dramatic struggle against this gigantic foe, Keisuke allowed himself to be "eaten" by King Dark, infiltrating its innards to discover the true mastermind of the organization, Dr. Noroi, a former friend of his own father. Despite being impaled through the chest by a spear from Scorpion-Geronimo Jr., Keisuke killed Noroi and Jr., obliterating King Dark in the process. Having miraculously survived, he left his comrades to seek out the other Riders and to continue growing, leaving behind a note to Tachibana in which he promised that he would return someday.