Mao

Mao is a minor villain in the first season of the anime series ''Code Geass. ''He is a Chinese orphan who was given the power of Geass by C.C.. His Geass manifests in the form of mind-control. Eventually, it went out of control and drove him insane. C.C. promised to stay with him always, as she was the only one whose mind he couldn't read. However, she eventually left him as he was unable to fulfill his side of the contract. Throughout his brief screen-time, his primary motivation is to make C.C. admit that he loves her and take him back. Because of this, he is a rare example of a male yandere.