Mayu Shikibe is a key character in the visual novel 'Riddle Joker.' She is a student at the same academy as the protagonist, where students with special abilities are enrolled. Mayu possesses a unique talent that allows her to manipulate the environment around her. Known for her calm and composed demeanor, she often acts as a mediator among her friends. Despite her stoic exterior, she deeply cares for those around her and is highly observant, often noticing things others overlook. Her role in the series is integral as she supports the protagonist and helps unravel the mysteries surrounding the academy.