Akahane Robin

Akahane Rubin is Ruby's younger twinsister. She goes to the same school as her sister. She and her sister are working at their parent's restaurant. Ruby attends to Nijiiro Private Middle School and is in the same class as Ruby. She is not as sporty as Ruby but much better in studies as her sister. Ruby and Rubin quarrel often, mostlikely once a day. But reconciled again quickly. After Ruby became Cure Crimson and started to take care of Scarlet, Rubin sometimes calls Scarlet a "cute little plushi" and mentions, that a cute doll, does not fit Ruby's personality.