Rikka Ishikawa (Rachel Woods) is one of the main protagonists of Doki Doki Pretty Cure (Glitter Force Doki Doki). Her alter ego is Cure Diamond/Glitter Diamond.
Maya's best friend since moving into her neighborhood ten years ago. She has long blue hair and eyes, and wears red glasses. At school she is the student council secretary, and is ranked among the top ten in the country in performing on the national mock exams. She often tries to keep Maya from going crazy. She says she is not athletic and is usually the last to be picked for a sports team. Her father is a photographer who travels a lot so Rachel writes him letters. As magical girl Glitter Diamond, she partners with the pixie Rory, her hair transforms into a light blue color with a long ponytail. Her attacks are icy blasts that freeze her opponents. Her theme color is blue and her playing card motif is the Diamond.