Ruru is a fluffy white dog character who always wears a crown. Born on November 19, he possesses the distinctive trait of being able to sleep anywhere, though he needs a pacifier to fall asleep. His preferred foods are desserts, especially crepes, parfaits, and daigaku imo. The emoji 👑 represents him. He lives as one of eleven characters sharing a residence within a collaborative group between Sanrio and the Japanese boy band JO1, specifically representing JO1 member Ruki Shirowa.