Cyan Hijirikawa is the main protagonist of the anime series 'Show By Rock!!'. She is a shy and introverted high school girl with a passion for music, particularly rock. Cyan discovers a mysterious guitar-shaped smartphone app that transports her to the world of Midi City, where she transforms into a catgirl and becomes the guitarist and lead vocalist for the band Plasmagica. Her character represents the journey of self-discovery and embracing one's talents. Throughout the series, Cyan learns to believe in herself and face challenges with courage, ultimately inspiring those around her.