Futaba Ayase, known as Ayafuu, serves as a main character in a multimedia project focused on competing idol groups. She is a member of the high-energy idol unit Lunatic Eyes, led by music producer Akihiro Tomita, who was reincarnated from the Sengoku-period general Date Masamune. Ayase is driven by her dream to become Japan's top idol and cultivate a distinctive personal style within the industry, fueling her persistent hard work through challenges.

Her personality reflects an ISFJ Myers-Briggs type and an Enneagram Type 3w2. This combination manifests as a potent ambition for success, recognition, and admiration. She is achievement-oriented, often prioritizing her goals above personal needs. Her ISFJ traits emphasize a focus on stability, tradition, and diligent effort, coupled with a strong concern for others' well-being. She values presenting a polished public image and actively seeks to connect with and bring joy to her fans, with this dedication being a core aspect of her identity.

Physically, she possesses gray hair styled to shoulder length and pink eyes. She stands 155 cm tall. Her birthday is January 12, placing her under the Capricorn zodiac sign, and she has blood type O.

Within Lunatic Eyes, she performs alongside Mirei Wakatsuki and Yui Kongouji. The group is defined by its energetic and high-intensity musical style. Ayase's commitment extends beyond personal ambition; she believes idols should embody figures who inspire forgiveness and acceptance of imperfections in others.