Toyohime Watatsuki is a lunar princess from the Touhou Project series and the elder sister of Yorihime Watatsuki. She serves as one of the two central Lunarian characters introduced in Silent Sinner in Blue, where she appears as a calm, elegant, and highly capable representative of the Moon. Toyohime plays a key role in defending the Lunar Capital and revealing the strict, distant nature of Lunarian society. She is associated with purity, authority, and a refined but intimidating presence.