[Sunred]

The real names of the onis in Kamen Rider Hibiki follow a certain naming scheme.
The first syllable of the oni's first name, last name, and oni name are the same.
Here are the known ones:

Kamen Rider Hibiki: Hitoshi Hidaka

Kamen Rider Ibuki: Izumi Iori

Kamen Rider Todoroki: Tomizo Todayama

Kamen Rider Zanki: Zaomaru Zaitsuhara

Kamen Rider Danki: Daisuke Danda

Kamen Rider Sabaki: Sakae Saeki

Kamen Rider Shuki: Shiori Shinagawa(in the case of Shuki, shu is written with "shi" and a small "yu" thus allowing the naming scheme to work in Japanese)