layla prismriver
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Creator of Touhou's Prismriver Sisters Lunasa, Merlin and Lyrica. Fourth and youngest sister of the original Prismriver sisters, never officially seen but usually portrayed with green hair to complement the poltergeists' colors. Layla created the poltergeists in the image of her 3 elder sisters after they parted ways following their father's death. The poltergeists have since survived their "originals" and Layla, and have since found a living as Gensokyo's resident musical trio.