Black Shadow, as described by Kinkotsuman, has the strength of Beauty Rhodes, the brutality of Ramenman, the technique of Robin Mask and the brains of Kinkotsuman. The last part of the description made Iwao worry, for good reason. During a riot at the opening ceremony, Black Shadow attacked its own partner!
When God Von Erich announced the tag tournament for control of American Chojin League, Kinkotsuman created Black Shadow to fight as Iwao's partner as representatives of the Kaijuu. Despite his allegedly formidable abilities, Black Shadow was torn to pieces by Skull Bozu and Devil Magician. His destruction forced Kinkotsuman to take his place.