Dr. Shinigami is a Shocker commander and a major antagonist in the Japanese TV series Kamen Rider.
He later returns as a secondary antagonist in the movies All Riders Vs. Dai-Shocker and Movie War 2010.
Summoned from Switzerland, Dr. Shinigami took command of Shocker's Japanese branch after Kamen Rider 2 destroyed Colonel Zol. He is mostly seen in his cape, holding a wand. He is able to transform into Ikadevil, a squid monster. In episode 68, he kidnapped Tobei Tachibana and forced him to train him so he can destroy Kamen Rider 1. As a result, Tobei discovers his weak spot: Ikadevil's head! When Kamen Rider 1 came to challenge him, Dr. Shinigami discards his cape and becomes Ikadevil to deal with Ichigo once and for all. Kamen Rider 1 overpowers Ikadevil by giving a Rider Chop on his head, and finishing him off with Tailspin Shoot. He is briefly brought back to life for a Destron operation, thinking he was to replace Doktor G, along with the other Shocker and Gel-Shocker officers. He along with the other resurrected officers is killed when the Destron base they are in self-destructs.
Due to a change in history caused by Ankh leaving a O Medal behind in 1971, Shocker achieved its goal of world dominion with the Shocker Greeed which defeated the Double Riders, and new members from the various groups that would had manifested in the normal timeline after Shocker's destruction. Ikadevil was among the many villains who were part of the this alliance. When the riders united against Shocker, he along with Ganikomol and Garagaranda was destroyed by Kamen Riders Den-O and New Den-O.
Kamen Rider DecadeIn the Decade continuity, Dr. Shinigami was an agent of the Dai-Shocker organization founded by Tsukasa Kadoya, Kamen Rider Decade. When Tsukasa lost his memory, Shinigami posed as Eijiro Hikari whose photo studio is the means of accessing the many other Kamen Riders' worlds. Though he assist Tsukasa in his mission, Eijiro revealed his true form as Dr. Shinigami when Tsukasa regained his memories. Though defeated by Decade, Diend, and Momotaros, Eijiro survived with no memories of being Dr. Shinigami. As Decade began his attack, Eijiro meets Narutaki who restores his memory as Ryubee Sonozaki gives him a Gaia Memory with full knowledge on Dr. Shinigami to transform Eijiro into Super Dr. Shinigami to lead the reformed Super Shocker. However, Super Doctor Shinigami reverts back to Eijiro as the Memory ejects out of him as the Super Crisis Fortress crashes with Natsumi saving him.
Super Hero Taisen ZIkadevil later returned as one of the sub-leaders of Space Shocker in Kamen Rider × Super Sentai × Space Sheriff: Super Hero Taisen Z, with a new form called Space Ikadevil. He is seen fighting Kamen Rider Fourze.