|Home world:||Hidden World|
|First appearance:||Mirrorman REFLEX|
Subtitle: Wicked Immortal Barb (棘邪仙, Toge Jasen)
- Height: 1.99 m
- Weight: 100 kg
- Origin: Yu Yu world
Powers and Weapons
- Strength: Kyuki is strong enough to give Mirrorman trouble and outclass him even when he is in his berserker state.
- Endurance: Kyuki survived a sword impalement in his back, but was felled by a slash to his head.
- Blades: Kyuki can summon twin blades, that are sharp and spiky like his body and able to withstand Mirrorman's weapons.
Before the being known as Kyuki came into being, there was Yamash, a solder and Akira's comrade and squadmate. However despite their friendship, on the battle field while they were hiding from enemy solders Yamash betrayed Akira and left several bullets in his chest killing him.
Several years later Yamash found himself locked in a room with several other men. There a woman appeared on a TV screen telling them that only the last man standing could leave, pointing to several blunt force weapons nearby. To prove her point she killed the one man that refused to battle, revealing they had miniature bombs in their digestive tracks. The woman disappeared saying she would check on them later.
When the woman entered the room some time later, only Yamash was still alive, though wounded. Before he could kill her and make his escape the woman activated the bombs in his stomach killing him. However that was not the end of him. For her master Yuichiro, the woman performed a ritual that called a demon from the Hidden World (The Spirit World) and merged it with the dead Yamash reviving him. Before Yamash could do anything, she was killed by her master in the same manner in which he died. As Kyuki now, he followed his orders and held the girl Momoso that came through the mirror followed by her uncle Mirrorman, only he was in a berserker state.
In their transformed states the two could see the true form of the other and almost immediately they recognized the other. When Akira demanded to know the reason for his betrayal Yamash nonchalantly declared it was to survive. Enraged Akira charged at him but the mirror demon was outclassed him, easily dodging him and brushing him aside. Thanks to Momoso, his transformation was undone and he transformed into his proper form. Despite this Akira was still being outmatched but a trick with his sword and chakrams allowed him to defeat Kyuki and have his revenge.
- Kyuki's human form/identity, Yamash, was played by Matsuyama Takashi who played Toga in the Heisei Ultraseven TV specials.
|Mirrorman REFLEX |
Kaiju & Kaijin
||Mirror Demons | Shiyu | Kyuki | Reiki|