Kari Sienahara (カリシエナ原 Kari Sienahara) is one of the main Cures in Cosmic Pretty Cure!! and is Mitsuki and Sakura's childhood friend. She is the daughter of Megumi and Kakashi Sienahara, owners of the Sienahara Planetarium and Franchises and is a 13-year-old cheerleader at Universal Private Academy. She is a troublemaker and not very liked by teachers, but encourages others to shine. Her alter ego is Cure Star and has the power over light.