Ritsu Sakuma is a fictional character from the multimedia project Ensemble Stars!, which includes games, anime, and manga adaptations. He is a member of the idol unit Knights, known for his laid-back and sleepy demeanor. Despite his apparent indifference, Ritsu is a talented performer with a unique singing voice. His character often brings a sense of calm and humor to the group. Ritsu has an older brother, Rei Sakuma, who is also an idol, and their relationship adds depth to Ritsu's character development throughout the series.