overhearing Baraom and Darom talking about Gorgom's rise to power and that they might pollute the oceans, so he rebelled as a result. Recruited by Baraom to defeat Black, the Kujira Mutant overpowered Black when Baraom arrived to take his King Stone. But learning the Mutant's intent, Baraom attempted to kill the Mutant along with Black. As a result, the Kujira Mutant became an ally of Kamen Rider Black before retreating into the sea. Upon learning of Black's defeat, the Kujira Mutant searched the ocean and found his body, using a revival ceremony of his clan within his cave home to bring him back to life. Darom and the Komori Mutant then went after the Kujira Mutant until Kotaro revived and came to his aid. However, the Kujira Mutant was forced to turn himself in to Gorgom to save a child's life. Darom used him as bait for Black, only for the Kujira Mutant to help Black defeat Darom. Though still wounded from the Kōmori Mutant's attack, the Kujira Mutant guides Black to the cave that is Gorgom's Shrine before being attacked by the Togeuo Mutant. Kotaro catches up as the Togeuo Mutant starts to overwhelm Kujira Mutant but is forced to the Creation King's palace with the Kujira Mutant telling Black to protect the oceans before he died. The Kujira Mutant's cave would later serve to give life to Rideron before it caved in as a result. Kujira Mutant is voiced by . RX characters Reiko Shiratori is Kotaro's girlfriend who is a photographer, helping him before and after learning he is Black RX. After learning that Kotaro is Black RX, she begins to train herself in order fight Crisis' minions. Reiko Shiratori is portrayed by , or Jun Koyamaki, who previously portrayed Diana Lady in Jikuu Senshi Spielban alongside fellow JAC actor Hiroshi Watari, who portrayed Yousuke Jou/Spielban. Sahara Family are the ones who took in Kotaro and gave him a job in their helicopter business Sahara Airlines. and are the parents who are always arguing with each other, is their son, and is their daughter. The parents are murdered by Jark Midla in episode 46. Shigeru is the first person in the series to know that Kotaro is Black RX. , , , and portray Shunkichi, Utako, Shigeru, and Hitomi respectively. Joe the Haze is a master of the fighting style . He is one of Kotaro's