Kyosuke Kiriya/Zi-O

In 2005, Kyosuke Kiriya (桐矢 京介) was Hibiki's apprentice, who transformed into Transformed Kyosuke (京介変身体).

Later in 2019, he inherits the name Hibiki (ヒビキ), and using the Hibiki Ridewatch, he temporarily becomes Kamen Rider Hibiki (仮面ライダー響鬼).

2005: Rejoice! Echo! Roar!
"My name is Kiriya Kyosuke...I am Hibiki."

- Kyosuke introduces himself to Sougo and his friends

Kyosuke meets Sougo and Geiz after their first encounter with Todoroki who was engaged in battle with Another Hibiki. After Another Hibiki escapes, Sougo and Geiz examines the nature of Another Hibiki and their quest to acquire the Ridewatches to Kyosuke, who in turn advises them to train to acquire Hibiki's power.

Kyosuke monitors Sougo, Geiz, and Woz as they train. Watching Sougo falter during his training, Kyosuke questions Sougo's goals. Upon learning Sougo's dream to become a king, Kyosuke advises him to abandon his dream if he didn't take it seriously.

When Another Hibiki resurfaces, Kyosuke reveals Another Hibiki to be his student Tsutomu Tsuzumiya as he transforms and attacks Geiz and Sougo, wishing to protect his pupil and resolve this situation by himself.

2019: Heisei Oni, Reiwa Oni
To be added.

2007: DenLiner Crash!
While Kyosuke does not appear in the Den-O arc, he is briefly mentioned. When Yuto Sakurai arrives in 2019, prepared to fight Zi-O, Sougo briefly mistook Yuto for Kyosuke.

Personality
In Zi-O, Kyosuke has grown into a more responsible man, but still has an arrogant personality, which he uses as a tactic to urge others to improve themselves. He has become a teacher, trying hard to live up Hibiki's reputation. However, he becomes less ambitious, and warns Sougo to be careful with keeping his dream, likely mirroring his failure on educating his student who had just become Another Hibiki.

Fighting Style
Being trained just like how Hibiki trained himself, Kyosuke used the similar fighting style as him although he lacked agility and easily to get caught on hit. So far, he is only seen to master the taiko style.

Devices

 * Henshin Onsa Onkaku: A fork-like transformation device.
 * Ongekikou Kaentsuzumi: A device that attaches on his belt for uses of finisher attacks.
 * Ongekikou Bakuretsu Kaentsuzumi: An upgrade version of the buckle.

Weapons

 * Ongekibou Rekka: Personal weapons

Attacks

 * Kibōjutsu: Rekkadan (鬼棒術・烈火弾): Kyosuke charges his drumsticks with power, igniting the tops with flames creating a torch-like weapon, which then shoots fireballs from each one at a target.

Ongeki Finishers

 * Ongeki Da: Kaen Renda no Kata (音撃打・火炎連打の型) While his Kaentsuzumi is attached to a large Makamou, Hibiki beats it 30 times rapidly with his Rekka. The Sound of Purification resonates through its body, causing it to explode.

Relationship

 * Disciple:
 * Tsutomu Tsuzumiya:
 * Kamen Riders:
 * Sougo Tokiwa/Kamen Rider Zi-O:
 * Geiz Myokoin/Kamen Rider Geiz:

Portrayal
Kyosuke Kiriya is portrayed by Yuichi Nakamura, who would later go on to portray Yuto Sakurai in Kamen Rider Den-O. As Transformed Kiriya & Kamen Rider Hibiki, his suit actor is Eitoku (永徳).

Appearances

 * Icon-zi-o.png Kamen Rider Zi-O
 * Episode 33: 2005: Rejoice! Echo! Roar!
 * Episode 34: 2019: Heisei Oni, Reiwa Oni
 * Episode 39: 2007: DenLiner Crash!