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 primary user of the Ixa System in the year 2008, 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 to God!" (ファンガイア…その命、神に返しなさい！, Fangaia… Sono inochi, Kami ni kaeshinasai!?)
Read more about this topic: Kamen Rider Ixa