Overview
Kumyo Kyo is the 4th Sovereign in the world of Honkai: Nexus Anima, governing the paired Aspects of Reality and Illusion. He is classified as a Sovereign Animaster and an upcoming 5-Star Kardia character. He appears as a young blond man who carries a parasol. His ability is called "But One Encounter." Community members have noted his visual resemblance to Aether, the male Traveler from Genshin Impact, though no narrative connection has been confirmed.
Relationship with Darsea
Kumyo Kyo is the elder brother of Darsea, the 10th Sovereign of Memory and Oblivion. After the Sundering shattered the Old World, he made a promise to his younger sister. The nature of this promise is tied to his most consequential act.
Powers
As the Sovereign of Reality and Illusion, Kumyo Kyo could create avatars using Reality and Illusion magic. This power has narrative significance, as the story references: "Kumyo Kyo said that I was the one who killed his sister... Darsea." The exact relationship between his avatar-creation ability and the protagonist's situation is one of the game's central mysteries.
Sealing the World-Ender
Kumyo Kyo fulfilled his promise to Darsea by sealing the World-Ender within the Plane of Illusion. This act required a tremendous personal sacrifice, and he disappeared afterward. His current whereabouts are unknown.
The sealing was necessary because the World-Ender had gained immortality through a Life-Death Contract with the Sovereign Amstradath, making it impossible to destroy permanently. Even Victus, who had defeated the World-Ender seven times, could not eliminate it for good. Kumyo Kyo's solution of imprisonment within the Plane of Illusion was the only effective long-term containment.