Christina Chu, often credited simply as Christina, is a Korean-Canadian singer. She was originally a member of Clazziquai Project in its original inception, alongside her sibling Alex Chu. But due to her work in Canada, she have to leave the group. Her position is later filled by Horan.
Unlike Horan, Christina's voice is clearer in pretty much every spectrum of her voice range; although it's pretty hard to notice at first. Thus, Christina's vocal character is bolder and far more expressive.
Despite not becoming a part of Clazziquai Project, Christina has participated in almost every Clazziquai Project albums as a guest vocalist. This also leads to her inclusion in DJMAX Portable Clazziquai Edition song list.