Alexander Yamato is a student at Schwarz Rose who appears in King of Prism -Tri-Star Act- as a representative of the rival school. He is known within the prism show world as a Prism Show destroyer and a street tyrant, reflecting his aggressive and confrontational approach to performance. Physically, he has short green hair, purple eyes, and a dark complexion. He wears multiple earrings on both ears and a neck chain, contributing to his street-style image. His personality is marked by a quick temper and a highly competitive nature, especially when it comes to street-style prism shows. He firmly believes that street style is superior to idol-style performances and holds a strong disdain for idols. This viewpoint drives his primary motivation: to challenge Kazuki, whom he considers his rival for the title of Street Charisma. In the context of -Tri-Star Act-, Alexander is part of the Schwarz Rose contingent entering the PRISM.3 trio tournament, where his combative skills and street-oriented prism abilities are put to the test. His notable abilities center on aggressive, high-energy prism performances that emphasize raw charisma and physicality over polished idol routines. Alexander’s background includes being a first-year high school student with a birthday of June 6 and blood type B. While his development across the series is limited, he consistently serves as a stubborn obstacle for the protagonists, particularly Kazuki, and his role in -Tri-Star Act- reaffirms his position as a dedicated rival from Schwarz Rose.