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Rosyuo is a White Overlord Inves and is responsible for countless murders of the old civilization trapped in the Helheim Forest, and has targeted Japan next. He is also the previous individual chosen by the Helheim Forest, and holds the Forbidden Fruit of his realm. He is a major antagonist in Kamen Rider Gaim.
His motive for everything is apparently caused by the results of his actions of making a Social Darwinist state into a reality, which destroyed his civilization, and making him outlive his wife.
He is unaware of Redyue plans to steal Forbidden Fruit he has guarded behind his back.
Rosyuo later ordered Demushu to stop attacking humans and retreated. However, Deemushu kept disobeying it. Having no other choice, Rosyuo telepathically called him to cause pain to Demushu, making the Red Overlord Inves retreat.
He later punished Demushu for disobeying his orders.
Rosyuo saved Takatora as he informed him about his origins. Rosyuo revealed the Helheim Forest was a civilization called "Femushinmu". He also tells that their civilization happily accepted Helheim and he was chosen by the Helheim to become the king. However, everything didn't turn out as he expected, as he had set the world into a Social Darwinist state. As shown, Demushu and Redyue killed their own people, showing the surviving strong had turned on each other. Rosyuo felt really guilty of what happened to his civilization and knows that the humans also will make the same mistake like him. Because of that, he won't give the forbidden fruit to anyone.
While informing Takatora about the Helheim's origins, including about his deceased wife, DJ Sagara appeared in front of Rosyuo to inform him that Demushu has recklessly struck Zawame City. Sagara also told Rosyuo that he has been cheating for having two forbidden fruit and suggested to give one of the forbidden fruit to the humans. Rosyuo then relinquished the forbidden fruit he guarded from his hand and turned it into the Kiwami Lockseed, giving it to Sagara to give to the rightful person to be its guardian.
Spotting an uninvited guest, Sid, Rosyuo shows how willing he is to prevent humanity from succumbing to the same mistakes as his own civilization by killing Sid, deeming him unworthy to have the forbidden fruit due to his foolish intention to use the forbidden fruit for his own selfish purposes.
Later, he allows Redyue to continue the invasion of the Earth, which shocked Takatora a lot.
Rosyuo is later confronted by Redyue, the latter of whom is threatening him to give her the Forbidden Fruit, which he refuses. He later informed her that he hid the second Forbidden Fruit in secrecy, so as to avoid it falling into the wrong hands. Enraged, Redyue brutally impaled him to death.
Though not much is known, Rosyuo has shown the ability to telepathically talk to other Over Lords and even cause them pain via telepathic feedback. As of right now, it is shown that Rosyuo possess a power that is beyond anything. With the myraid of powers such as telekinesis, Rosyuo is practically the god of his realm, able to fling targets far away, move rock formations such as mountains, and disintegrate any kind equipment, such as the Genesis Driver, through brute force alone.
The origin of his name Rosyuo (ロシュオ?) might be coming from "Hakua" (はくあ?), means "Chalk" in Japanese.
Rosyuo and the other Overlords seemingly has its own language. This is similar to the Gurongi Language from Kamen Rider Kuuga, the Undead from Blade and Fangire from Kiva, in which an enemy faction has its own language that the Japanese do not understand. As with the Gurongi, Japanese subtitles aren't provided for Rosyuo's speech, it is unknown if they will be provided in a later release such as a TV rerun or DVD release.