Shuki

Personality
Though she is in her eighties, Shuki used her power to assume a form that resemble herself in her early 30's. She is also one of the few Oni to use the Firebird shikigami, an ancient technique no longer used by present day Oni. Furthermore, Shuki knows every incantation in the Oni's arsenal, including forbidden ones.

Fictional character biography
When she was young, her entire family was murdered by the Makamou Notsugo. She used this as a reason to become an Oni. Unlike other Oni though, she used personal grudge and not the desire to uphold justice and protect the weak as a reason to fight the Makamou, and because of this, Shuki's forehead emblem had grew over her face, which explains why her looks are so different from the other Oni. This would also lead to her disgrace and stripping of her Oni title when she nearly killed her student, Zanki, in an attempt to destroy Notsugo by aiming for his one weakspot: its mouth. She was given a student long before she was ready to take one on, but had no choice due to the death of her friend, the original Zanki.

Years later she would return to the battlefield, using an Oni Armor to fight Oni in order to steal a Henshin device from them to resume her Oni form and battle the Notsugo once more. Though the armor was destroyed, Shuki managed to get Todoroki's Henshin Kigen and become Kamen Rider Shuki once more. The Man and Woman attempted to recruit Shuki, but she refused their offer, overpowering SuperDouji & SuperHime before retreating in a blaze. Later on, she took in Akira Amami as her apprentice due to seeing similarities in her want to be an Oni. Shuki's hate of the Makamou would be her downfall, as she was caught in the mouth of Notsugo, she killed herself as a means to get her revenge on it finally, with Zanki finishing the monster off. Dying, Shuki asked Zanki to honor her by covering her in flowers so no one can see her true face.

Arsenal

 * Ongekigen Kitara (音撃弦・鬼太樂 ?)

Shuki uses a harp as her weapon and is used two ways, either by playing its strings causing an energy wave or pulling the strings creating an energy arrow to shoot at her enemies.

OnGeki Finishers
Ongeki Sō Shinten Dōchi (音撃奏・震天動地 ?)