Yuni

A shapeshifting catgirl from the Planet Rainbow whose people were turned into stone as the result of Aiwarn's experiments. Using a perfume to assist with her shapeshifting, with her ears and tail always remaining, Yuni has searched for a way to restore her people by assuming the identities of phantom thief Blue Cat to steal stolen treasures, the intergalactic pop idol Mao to gather information, and Aiwarn's butler assistant Bakenyan to infiltrate the Notraiders. After becoming a Precure, Yuni joins Hikaru and the others to search for the pens with them. As the blue and rainbow-colored Cure Cosmo, whose motif is the rainbow, she is armed with the Rainbow Perfume which she uses in her "Cosmo Shining" attack with its "Rainbow Splash" variation with a Princess Star Color Pen.