Aya Tsuji (辻 彩 Tsuji Aya) is a supporting character featured in Diamond is Unbreakable. She features centrally in the arc Yukako Yamagishi Dreams of Cinderella and in a key role at the finale of Sheer Heart Attack.
She is the manager of and sole aesthetician in the Cinderella beauty salon. When Yukako Yamagishi enters her salon, Aya modifies her face to be more attractive. Aya is a Stand User, and works though her Cinderella.