Tsubaki

Tsubaki was a young miko (Shrine Maiden) in training like Kikyo when she was alive. She studied under a priest at a Shinto shrine as an apprentice and she and Kikyō were rivals, sometimes battling side-by-side to defeat yōkai, Tsubaki always attempting to better Kikyō using her own holy power. While Kikyo and Kaede were traveling the countryside to visit small villages and help slay yōkai, Tsubaki laid a curse on Kikyo, telling her that as a miko she must abandon her heart, for if she ever fell in love with a man she would lose her holy powers and suffer an untimely death answered by Kikyo's cool denial. Spoiler Tsubaki only places the curse on Kikyo in the anime.