Alexander Yamato is a prominent character in the King of Prism series. A student at Schwarz Rose Academy under the Thunder brand, he stands 190 cm tall with a dark complexion, short green hair shaved on the sides, violet eyes, multiple earrings, and a neck chain. His birthday is June 6, making him 16 years old during earlier events and 17 in later stories like Shiny Seven Stars. He is of mixed Japanese and American heritage. Known as the Prism Show vandalist and street tyrant, Alexander aggressively champions raw street-style prism performances while scorning traditional idol-style shows. His personality is fiercely competitive and quick-tempered, yet he shows unexpected politeness toward those he admires, such as the veteran Prism Star Rei Kurokawa. His driving motivation is to claim the title of street charisma, currently held by his ultimate rival, Kazuki Nishina, leading to frequent clashes not only with Kazuki but also with Taiga Kougami. In King of Prism: PRIDE the HERO, Alexander sabotages a performance to disgrace Kazuki, escalating into a prism duel where he is defeated by Taiga Kougami. This defeat becomes a turning point, forcing him to accept that authentic connection with the audience matters more than performance style. By the time of Shiny Seven Stars, he works at Prism Stone alongside his Pair Friend, a dragon named Dorachi. As a Prism Star, he has achieved an S-rank on Schwarz Rose’s evaluation system, wields a signature counterattack called the Steel 6-Pack-Core Wonder, can summon a black dragon, and belongs to the Thunder series. A childhood marked by sickness and bullying changed when Rei Kurokawa saved him with a street-style performance, inspiring Alexander to become stronger. His performed songs include "EZ DO DANCE" remixes, "Masquerade," "Survival dAnce ~no no cry more~," "Silver and Gold Dance," and "Starved For You."