Yaya Yuiki (結木やや, Yuiki Yaya) is the childish girl serving as the Ace's Chair and is one year junior to Amu. Yaya often acts immature for her age, such as having an enormous sweet tooth, and a great soft spot for items like ribbons as well as tending to be hyperactive. Yaya wants to be a baby forever, so her parents would give her more love than her younger brother. She is also a good ballerina, but also a rather clumsy one. Yaya's favorite things are cute and babyish. Voiced by: Tomoko Nakamura