Matsuri Yakumo

Matsuri Yagumo is a world renowned classical concert pianist, who despises the formality affiliated with a position of such stature due to how it conflicts with her typical personality, which is characterized by her rampant alcoholism and motorcycle enthusiasm. As a veteran drifter, she has already cleared Nemesis Q's devious game but because her calling card's value has already descended to zero, she cannot directly assist other participants. Instead, she acts as a mentor only, most notably towards Sakurako Amamiya. She reacts playfully in regards to Ian's and Kagetora's crush on her.

She is concerned about Yoshina Ageha and Oboro's abilities, and tells Hiryuu Asaga that he's the only one who could take them down if necessary. (Source: Psyren Wikia)