Nago Keisuke

Kamen Rider Ixa (仮面ライダーイクサ, Kamen Raidā Ikusa?) is the secondary protagonist and fictional character that appears in Kamen Rider Kiva, a Japanese tokusatsu television drama in the Kamen Rider Series. Ixa is the second Rider in Kiva. "IXA" is an acronym for "Intercept X Attacker." Whereas Kiva is based on various monsters, Ixa's motif is that of a knight and the Christian cross. Ixa's name in Japanese comes from one of the readings of the kanji for "fighting," "war," and "battle" (戦, ikusa?).

While the Ixa System is promised to Yuri Aso, Jiro is the first user of the System in 1986, using it to save Yuri from the Earwig Fangire. It is initially meant for Yuri to use as she sees it as a memento of her late mother, but after learning of its flaws and seeing Jiro's resolve, Yuri allows him to keep the Ixa System. When Otoya Kurenai learns of Jiro's plans, he takes the Ixa System to fight Jiro as its second user. After Basshaa's intervention between Jiro and Otoya, Jiro once again acquires the Ixa System, using it to fight the Lion Fangire Rook in revenge for the slaughter of the Wolfen Race. However, Otoya briefly regains the System after the Rook defeats Jiro as Ixa, with he and Jiro arguing who is its rightful user soon after. After Yuri's attempt to use the Ixa Knuckle, and Jiro leaving after revealing his true identity to her, Otoya becomes the official user of the Ixa System. After briefly being used by Rook, Otoya regains the belt and then lends it to Yuri to use against the Rook in battle, succeeding in wounding the Lion Fangire instead of the intended goal to kill him. Although the system is returned to Otoya afterwards, Yuri steals it once more in her attempt to destroy Maya, the Fangire Queen, out of jealousy. During Yuri's third attempt to destroy Maya, the King of Fangire, Dark Kiva, interfered and forces Yuri to retreat. Otoya uses the system to battle Dark Kiva, but is defeated easily and held captive within Castle Doran. He is rescued by Yuri and uses the system to defeat the Silkmoth Fangire. Otoya would use the Ixa system one final time to battle the Bat Fangire in a beachside battle, but he is again overpowered and the armor is severely damaged. Over time, the Ixa System is retrieved and perfected, with Keisuke Nago eventually becoming the system's main user in 2008.

In 2008, the original official user for the Ixa System was Keisuke Nago. However, Ryo Itoya stole the Ixa Knucle from Nago and used it in an attempt to impress Megumi, only to be tricked by Megumi and the system was returned to Nago soon after. Megumi borrowed the System once to kill the Rook to finally finish what her mother started years ago. Due to Nago's incapacitation, Kengo Eritate was appointed the new primary user for Ixa, although his ability to use the system was quickly cast into doubt after his failure to destroy Kiva. After being defeated by Bishop, Nago relieves Kengo of the Ixa System, becoming its primary user once more.

Keisuke Nago (名護 啓介, Nago Keisuke?, portrayed by Keisuke Kato) is a 22-year-old elite member of the Wonderful Blue Sky Organization and former member of the 3WA (World Wide Wing Association), a loser at that time who left the organization due to his animosity towards its top agent Takato Shiramine who never respected him. He is the current user of the Ixa System, working as a bounty hunter by capturing criminals and taking a button from them as a memento. He originally had an intense hatred towards Kiva due to what he heard of the previous one, intending to kill him until he learns of Kiva's true identity and sees him as an ally to mankind. He also has a belief in "humanity's full potential", which gives him the impression of a superiority complex to some people with the ideal that he's always right. He has a prejudice for certain people like Wataru, as he believes they are everything his ideology of "humanity's full potential" is against. Because of this ideology, he has a distaste for music, as he feels it is a waste of that potential. It was due to his intolerance for sinners that Nago played a part in the suicide of his father years ago, exposing him to the media for taking a bribe. However, though he has a sense of righteousness, Nago's perspective on it is warped in his desire to purge the world of evil, refusing to accept the world in grey and going berserk whenever he loses a fight or is denied his quarry. Over time, most of these personality traits would eventually wane, although his sense of justice has not changed. When Nago transforms to Ixa, he first says, "Fangire… Return that life you took to God!" (ファンガイア…その命、神に返しなさい！, Fangaia… Sono inochi, Kami ni kaeshinasai!?).

Ixa does not have forms as the biologically/mystically powered Kiva does, but instead has two Modes as he uses a Rider System (ライダーシステム, Raidā Shisutemu?). Ixa's default mode is Save Mode (セーブモード, Sēbu Mōdo?) and can transform into Burst Mode (バーストモード, Bāsuto Mōdo?) where the faceplate that covers Ixa's eyes in Save Mode open up.

Source: Wikipedia