Ichiro Tachibana ( 立花 勢地郎, Tachibana Ichirō) The current head official of Takeshi's Kantō branch and father of the Tachibana sisters, a cheerful man who gives the Oni under him thoughtful advice while sending them out on their missions while having a personal library where he researches the Makamou. While he ended up dead when forced to transform again, he uses a forbidden spell Shuki taught him to remain among the living until Todoroki is able to stand on his own two feet. Due to an injury he suffered from mentor Shuki during his days as her apprentice, Zanki resolves to serve as Todoroki's support while his apprentice takes over his duties as an Oni. Using the Transformation Oni String Onka ( 変身鬼弦・音伽, Henshin Kigen Onka) bracelet, he can transform into Kamen Rider Zanki ( 仮面ライダー斬鬼, Kamen Raidā Zanki) and uses his OngekiShingen Retsuzan ( 音撃真弦・烈斬) guitar as his weapon. Zanki ( ザンキ) Real name Zaoumaru Zaitsuhara ( 財津原 蔵王丸, Zaitsuhara Zaōmaru), he is among the most seasoned of the Oni with Todoroki as his apprentice. After becoming an official Oni, Todoroki is given his mentor's Ongekigen Retsurai ( 音撃弦・烈雷) guitar for his own. To transform, Todoroki uses the Transformation Oni String Onjo ( 変身鬼弦・音錠, Henshin Kigen Onjō) bracelet. Todoroki ( トドロキ) Real name Tomizo Todayama ( 戸田山 登己蔵, Todayama Tomizō), he was originally an apprentice to Zanki who resolved to make a name for himself as the present-day Kamen Rider Todoroki ( 仮面ライダー轟鬼, Kamen Raidā Todoroki) rather than inherit his master's title. While able to become an Oni, she eventually gives up her goal of being an Oni following her time with Shuki and resumes a normal life. Akira Amami ( 天美 あきら, Amami Akira) Ibuki's apprentice, who wanted to become an Oni out of revenge after her parents were killed by Makamou. Using the Transformation Oni Whistle Onteki ( 変身鬼笛・音笛, Henshin Onibue Onteki), he can transform into Kamen Rider Ibuki ( 仮面ライダー威吹鬼, Kamen Raidā Ibuki) and use his Ongekikan Reppu ( 音撃管・烈風, Ongekikan Reppū) trumpet gun as a weapon. But Ibuki gradually begins fearing death while realizing he was not as strong as he assumed himself to be, though he musters the courage to help Hibiki during the Orochi event. Ibuki ( イブキ) Real name Iori Izumi ( 和泉 伊織, Izumi Iori), he is a composed member of an Oni family that oversee Takeshi's Yoshino headquarters and takes that position of protecting others and taking extremely dangerous missions with pride. He later acquires the ability to become Hibiki Kurenai ( 響鬼紅) from his summoning training, and then Armed Hibiki ( 装甲 ( アームド )響鬼, Āmudo Hibiki) with a modified ancient weapon known as the Armed Saber ( 装甲声刃 ( アームドセイバー ), Āmudo Seibā). Using the Transformation Tuning Fork Onkaku ( 変身音叉・音角, Henshin Onsa Onkaku), he transforms into Kamen Rider Hibiki ( 仮面ライダー響鬼, Kamen Raidā Hibiki) and use his Ongekibou Rekka ( 音撃棒・烈火, Ongekibō Rekka) drumsticks as bludgeoning weapons. He takes Asumu under his wing, helping in anyway that includes giving him needed advice. Hibiki ( ヒビキ) Real name Hitoshi Hidaka ( 日高 仁志, Hidaka Hitoshi), Hibiki is among the most seasoned Oni with a strong sense of ethics and believes in constantly training oneself to keep up with their strength while being somewhat of a mentor figure.
It also has some resemblance with the real name of the Oni. The title of every Oni bears the -ki suffix (鬼), which is semantically identical to "Oni" in Japanese language. The combatant agents of Takeshi are known as Oni, who have long protected humans from the Makamou for centuries. In the present day, Takeshi has offices across Japan composed of Oni and a backup team that provided intelligence and support. Takeshi ( 猛士) is a secret organization based in Yoshino, Nara, having been established two centuries ago as a partnership between the Oni and a select group of humans to defend Japan from the Makamou. However, the sudden rise of Makamou numbers proves to be a prelude to an upcoming calamity.
Asumu learns to be an adult through watching Hibiki and the other Oni as they all train together to hone their skills in fighting the Makamou and the homunculi aiding them. One of the Oni, a man named Hibiki, ends up having a "teacher-and-apprentice"-like relationship with Asumu Adachi, a young boy unsure of himself and is at a crossroads in his life as he transitions to high school. The Kamen Riders, known as Oni, battle man-eating beasts called Makamou with "pure sound". An 8 Hours of Suzuka Honda Bike with Kamen Rider Hibiki sponsorship