Chūshiki (虫食, Chūshiki) is an ancient being whose existence is better regarded as Forgotten (忘れ物, Wasuremono). During the time period in which he truly lived, Chūshiki was a direct student to Hagoromo Ōtsutsuki whom, as a result of his talent and ambitions, was given a small portion of the power that contained the Sage's "Ideals" (理想, Risō), leading him to awaken the Rinnegan.