Also known as: 先代博麗の巫女, 先代巫女
先代博麗の巫女 (Sendai Hakurei no Miko, "The previous generation's Hakurei shrine maiden")
This tag is a catch-all for various Touhou Original Characters depicted as Reimu's predecessor. The most famous version and original source of the name being a fanmade M.U.G.E.N character by MUGEN author Pre-to.
She is usually depicted as Reimu's mother, though as a fan character her relation to Reimu on the Hakurei family tree can change with each depiction.
A very popular fanwork featuring another version of this character is Osana Reimu and its sequel Reireimu, a story about Sendai Miko, a young Reimu, and an adult Rumia.
She is not the canon character revealed at the end of Foul Detective Satori. For that character, use the tag Gensokyo'S First Hakurei Miko.