Yotsugi looks like a 12 year old girl with turquoise hair, green eyes, pointy ears, and a strange orange hat with googly eyes. Her outfit consists of a frilly orange dress in varying shades of color, striped blue and grey stockings, and yellow boots.
Due largely to the circumstances surrounding her creation, Yotsugi is seemingly void of any obvious personality traits. Her facial expression rarely changes from neutral and she speaks in a flat, monotone voice. Throughout the series she explores her identity by adopting various signature phrases and gestures: In her first appearance, she would frequently end statements with "Boku wa kimegao de sou itta", roughly meaning "I said, with a posed look", notably using the masculine "boku wa" to refer to herself.
She would later drop this phrase out of embarrassment and regret, indicating her ability to express such emotions in her own way; when Koyomi Araragi mentions the subject he is immediately hushed by her and told never to bring it up again. She has chosen thus far to retain the mannerism of referring to Koyomi as "oni no onii-chan", often translated as "devilish big brother" or "devil boy". She has been shown to address Deishuu Kaiki as onii-chan as well, greeting him with a peace sign hand gesture and the words "yay" and "peace", much to his annoyance. This mannerism has since been maintained. She also has an appreciation for muscles.
Yotsugi was once a human before she died and became a corpse. Eventually, she was resurrected as a doll-like tsukumogami by members of the Occult Research Club. Ononoki had to choose between Tadatsuru Teori and Yozuru Kagenui to decide who would be her master as a shikigami. Ultimately, she chose Kagenui, forging a bitter rivalry between Tadatsuru and Kagenui.
Yotsugi is first seen while Koyomi is with Mayoi Hachikuji. She and Kagenui are specialists who specialize in immortal creatures thus they try to kill Tsukihi Araragi who is immortal and is a "monster", an "Evil Phoenix". She was defeated by a powered up Shinobu. She seems to know about Koyomi's past as she calls him "Devil Boy".
Yotsugi has a power called Unlimited Rulebook which allows her finger to shape-shift and cause explosions. The power can also be used for other things such as large jumps that behave similar to teleportation.
- Yotsugi's first name literally means "cotangent", which shares a similar theme as Yozuru's name, which means "cosine". Her surname means "axe in a tree".
Characters of the Monogatari Series
|Araragi Family||Koyomi Araragi • Karen Araragi • Tsukihi Araragi • Araragi Matriarch|
|Heroines||Hitagi Senjougahara • Mayoi Hachikuji • Suruga Kanbaru • Nadeko Sengoku • Tsubasa Hanekawa/Black Hanekawa • Shinobu Oshino • Sodachi Oikura • Ougi Oshino|
|Exorcists||Meme Oshino • Deishuu Kaiki • Yozuru Kagenui • Yotsugi Ononoki • Izuko Gaen • Tadatsuru Teori • Seishirou Shishirui|
|Vampire Hunters||Dramaturgy • Episode • Guillotine Cutter|
|Other Characters||Hitagi's Father • Hitagi's Mother • Tsunade • Mayoi's Father • Tooe Kanbaru • Suruga's Father • Suruga's Grandmother • Nadeko's Parents • Tsubasa's Parents • Mizudori • Rousokuzawa • Higasa • Rouka Numachi • Sasayabu • Komichi Tetsujou|