Reimu's predecessor. No one remembers her name now, but the older residents of Gensoukyou remember her as being very talented in her role as the Hakurei miko.
Since she lived in a time before the spellcard rules were invented, her methods of dealing with troublesome youkai were rather more brutal: powerful physical blows backed by fast movement and divine power, breaking bones and crushing organs.
A result of this is that her customizations to the miko uniform reflect the need for hand-to-hand combat. She wears a one-piece skintight undergarment rather than a sarashi, sturdy combat boots, and a hakama rather than a skirt.
Also, unlike Reimu, she does not wear a ribbon on the back of her head, although in some depictions, she wears one to tie her long hair together near the end.