Aoki Lapis is a fairy who has no memory of who she is. She belongs to a race of fairies capable of transforming music into power and her voice is said to have the power to give life when she sings. Her design is "light" in contrast with her sister Merli, who is darker. Merli and Lapis despite being sisters are also portrayed as rivals, making them the first protagonist and antagonist of Vocaloid. Aoki Lapis was a light and cheerful vocal that was intended for "lifestyle" genre of music.