|This article is about a character in Kamen Rider 555.|
Shingo Ota (太田 信吾, Ōta Shingo): A member of Ryusei School. After Mari's second death by Sawada, he constantly tried to persuade Mihara to fight with the members. Later killed by Sawada. Shingo Ota is portrayed by Takuji Kawakubo (川久保 拓司, Kawakubo Takuji).