Yotsugi Ononoki

Yotsugi was first introduced in Tsukihi Phoenix. She is Yozuru's shikigami. She always address herself with the masculine first-person pronoun boku and thinks of Yozuru as her sister. She has an ability called Unlimited Rulebook where she can shape-shift her finger. She was challenged to a fight by Shinobu in the end of Tsukihi Phoenix and was beaten to a bloody pulp by her. Just like Shinobu who had her name set by Oshino, her name was helped set by Kaiki as Yozuru didn't have the courage to bind Yotsugi. She was once a human and was resurrected and created as a tsukumogami by a half dozen genius specialists (which includes Kaiki and Yozuru) as a school project. They all had ownership over her but most of them gave up their claim. Yotsugi decided to have Yozuru as her master and in exchange, she becomes Yozuru's fighting partner. However, as a shikigami, she does not suffer any permanent damage. She is a shikigami and a tsukigami and that she was previously a human.

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