, the , is the fifth member of the team, colored white with orange accents in a suit that resembles a karate uniform. He is a prodigy who trained at the Beast Origin Village and mastered one of the oldest fighting styles in the Beast Arts, the , to overcome the pain of losing his mother at a young age. Ken was originally to aid Ran and Retsu, but travelled abroad since his Geki Changer was broken. He also sold the SoZyuTo that Xia Fu gave him for travelling money. He is a free spirit, and does not restrict himself by talent or ties to the Geki Jūken. Ken can utilize the , a karate technique in which he condenses his Geki into a diamond blade on his hand with which can cut through anything. He eventually manifested Kageki on Christmas Eve out of his passion for the holidays. He frequently uses the word , which is karate term meaning "patience with myself and others". He also uses "kenzan", an archaic Japanese word that means "just arrived" and is also a pun on his name, Ken. Using the SoZyuTo, he can summon and control SaiDain/SaiDaiOh. "Hisatsu ken" can also translate as "hidden technique", which Ken has. After the final battle is over, Ken returns to work at SCRTC Meisters.