Eijiro Hikari

Eijiro Hikari is the owner of the Hikari Studio and Natsumi's grandfather. When he discovers that his photo studio is the means of accessing the many other Kamen Riders' worlds by accident, he is not surprised but amused at the fact and is glad to assist Tsukasa in his mission. Whenever they arrive to a different world, he cooks a different meal each time. Eijiro is also the most easygoing of the group and gets along well with Kivala.

In the film, Kamen Rider Decade: All Riders vs. Great Shocker, Eijiro is revealed to be the alter ego of Doctor Shinigami, an executive member from the terrorist organization Shocker able to assume the form of the Inhumanoid Ikadevil.

Eijiro Hikari is portrayed by Renji Ishibashi.