Lunasa Prismriver is a ghostly youkai musician from the Touhou Project series and the eldest of the Prismriver Sisters. She is known for playing the violin and performing in the trio’s elaborate danmaku concerts. Calm, quiet, and somewhat melancholic, Lunasa contrasts with her energetic sisters Merlin and Lyrica. Together, they serve as recurring characters who bring musical flair and whimsical charm to the series, often appearing as performers at events and in side stories.