Kouta Kazuraba (葛葉 紘汰, Kazuraba Kōta) is an earnest and cheerful young adult who is naïve, wanting to help others but ends up sometimes causing trouble than good due to his short-sightedness. He is originally the second-in-command of Team Gaim before eventually quitting the team to take odd jobs to help out his older sister Akira since their parents have died. But things change when Kouta is called by Team Gaim's leader Yuya Sumii, who wants to show him something to help their team out. This leads Kouta to search for Yuya in what he later learns to be Helheim Forest, finding a Sengoku Driver (戦極（センゴク）ドライバー, Sengoku Doraibā) that his friend bought from the mysterious Lockseed Dealer Sid and an Inves that he managed to destroy. Figuring out a means to best use his new-found power, it takes seeing the rampage by Kaito's summoned Inves to convince Kouta to protect people as Kamen Rider Gaim (仮面ライダー鎧武, Kamen Raidā Gaimu). [note 1] This event spreads across the city, earning Kouta the name of "Armored Rider Gaim" as he decides to help Team Gaim as an official member in Yuya's stead as more Armored Riders appearing in Zawame. Eventually, with help from Mitsuzane, Kouta learns that Sid is working with the Yggdrasill Corporation in an experiment involving the Armored Riders with DJ Sagara giving him a Lemon Energy Lockseed and a Genesis Core. While dealing with the public's prejudice against the Beat Riders, Kouta learns the truth of Helheim Forest, Yggdrasill's goals, and the truth that the first Inves he killed was actually Yuya. While he is still trying to figure out what to do with this new information, Kouta is approached by Sagara and learns of the Inves known as the Over Lords while advised to shatter the rules that the Yggdrasill Corporation is following in order to change the world for the better. Given the Kachidoki Lockseed to achieve that goal, Kouta tells Mai everything he knows to Mitsuzane's displeasure while managing to win Takatora over with a way they can save the world without sacrificing human lives. At this point, Kouta finally gets a job at Drupers, but only after his sister is downsized and he must find some form of work. During the Lover Lord Dēmushu's invasion into Zawame, he is critically injured by the Yggdrasill Corporation force's sudden attacks on him, resulting in Dēmushu landing a fatal blow on Gaim, until Baron rushes to his aid and retreat to Team Gaim's place safely. Gravely wounded, Kouta has another encounter with Sagara who offers him the Kiwami Lockseed to help him obtain the Forbidden Fruit to save his world. Though warned that he would have to kill everyone else who is after the Forbidden Fruit and would eventually become an Over Lord himself, Kouta accepts the Kiwami Lockseed. As he uses the Lockseed, Kouta unknowingly becomes more like the Over Lords, even gaining the ability to use the plants to his advantage after battling Redue and Roshuo. However, Mitsuzane plans to fight him with his new Ryugen Yomi transformation, and during the fight, Kouta intentionally lets his guard down, taking a seemingly fatal blow from Ryugen Yomi, all in an attempt to get his friend back to normal. Kouta's wounded body is later found by Chucky and Peko and brought back to the garage for treatment. In his injured state, Mai visits Kouta spiritually and warns him about Kaito wanting to use the Forbidden Fruit to change the future. While trying to learn if Redyue and Roshuo's words about him becoming an Over Lord after obtaining the Kiwami Lockseed are true, Kouta starts to test it out by eating the Helheim's fruit. When it has no effect on him at all, he realizes that they were right in their warnings. After killing Kaito, Kouta receives the Golden Fruit and evolves into the blonde-haired Man of the Beginning (始まりの男, Hajimari no Otoko). Not wanting to destroy the current world nor rule it as it is, he uses his power to open a crack in space to send all of the Inves and Helheim Forest onto another barren world at the far end of the universe, where he and Mai will create new life instead. Seven months later, when Kogane returns as Armored Rider Jam – possessing the form of a teenage girl and beating Mitsuzane close to death – Kouta returns to Earth to help Mitsuzane destroy the Locust Monster, and splits Kogane from its host, so both Gaim and Ryugen can finish it off for good. After the last fight with Kogane, Kouta leaves Earth once more, saying goodbye to both Mitsuzane and the spirit of Kaito who is lingering behind at the relocated sacred tree.