Sonomura (曽野村 Sonomura) is the leader of the Beat Rider Team Red Hot. He was originally meant to become an Armored Rider until Oren Pierre Alfonzo, who had been watching a new Inves Game Armored Rider battle for many days confiscated the Sengoku Driver and Durian Lockseed from him and considered him unworthy to use that device, due to having a weak fighting skill records.