Shiomaneking

Shiomaneking (シオマネキング) - A fiddler crab monster. Destroyed by Kamen Rider #1 and Kamen Rider #2's Rider Reversal and Rider Double Kick.

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. Shiomaneking was among the many monsters who were part of the this alliance.

Behind the scenes
In his appearance in OOO, Den-O, All Riders: Let's Go Kamen Riders, Shiomaneking was voiced by Hisafumi Oda (小田久史). His suit actor was Fumiya Touei (藤榮 史哉).