Yotsugi Ononogi is a major character in the Monogatari series, created by Nisio Isin. She is a tsukumogami, an aberration born from an object, specifically an old doll, and serves as an assistant to Yozuru Kagenui, a specialist who exorcises aberrations. Despite her emotionless demeanor, Yotsugi often uses the phrase 'I said with a posed look' after her sentences. Her role in the series often involves aiding the protagonist, Koyomi Araragi, with her unique abilities, including levitation and manipulating her own body parts for combat.