Yuni Hoshina, also known as Cure Cosmo, is a main character in the anime series 'Star☆Twinkle Precure.' She is an alien with the ability to transform into various forms and is the last surviving member of her race from the planet Rainbow. As Cure Cosmo, she joins the Precure team to help them collect the Princess Star Color Pens and fight against the Notraiders. Yuni is courageous, resourceful, and deeply cares for her friends, playing a vital role in the group's mission.