Gender: Female The bright and cheerful only daughter of Tamaku, the founder of "Ultimate Karate." Back when she was just an ordinary citizen, she was kidnapped by a mafia group called "Big Man" who held a grudge against Tamaku. This experience led her to join her father's dojo, albeit late in life. She possesses a genius-level talent inherited from her father (perhaps even surpassing him in raw sense). Despite starting in her late teens, she rose to the rank of instructor in just a few years. Perhaps because of this, she is highly confident, never considers the possibility of losing, and has a habit of provoking her enemies. Abilities: She uses techniques based on the dojo's original "Ultimate Karate," but with her own personal modifications. Fighting Style: She utilizes her agile body for acrobatic kicking techniques and employs "Riyu Originals" not found in standard Ultimate Karate, such as slaps and hip attacks. Roberts is her boyfriend.

Gender: Male To get revenge on Riyu's father, he intends to thoroughly humiliate and trample over her. Abilities: He uses a technique called "Orochi," where he dislocates his arm joints and infuses them with energy to extend his reach by about two meters. The extension is high-speed, allowing him to fight at any distance. Furthermore, he possesses incredible toughness and excels at countering while taking hits. Fighting Style: In addition to the aforementioned abilities, he has no hesitation in using blades, foul play, or surprise attacks. Snake is his trusted subordinate.