Riamu Yumemi is a character from the multimedia franchise The Idolmaster, specifically from the mobile game The Idolmaster Cinderella Girls: Starlight Stage. She is a 19-year-old idol with a unique personality that combines a sense of insecurity, attention-seeking behavior, and a desire to be popular. Riamu often refers to herself as a 'yume kawaii' idol, a style that blends cute and dreamy aesthetics. In the series, she acts as both comic relief and an insightful commentator, offering a glimpse into the complexities of idol life and the pressures of fame.