Iki Hiyori is a kind-hearted girl with a strong sense of right and wrong. This is evident when she witnesses Yukine swindling money behind Yato's back and is openly troubled; eventually, she confronts him to ask what he intends to do with it. Hiyori is also characterized by a deep loyalty to those she trusts and a tendency to express her emotions. When Yato's body is overcome by impurity, she does not hesitate to carry him on her back despite her knowing that impurity is transferred through touch. She often acts motherly towards Yukine, worrying about him and helping him with his studies, and is often indignant at Yato and his decisions. Although she often smacks him when she is displeased, she cares about him and Yukine very much.

Despite being raised to be completely lady-like, Hiyori is a huge martial arts fan and has a fixation on a martial artist called Tono, whom she copies her attacks from and will often become inspired and act on his words; when she remembered Tono telling everyone to pave their own destiny with their own hands she decided to do so.

Abilities

Hiyori has no abilities in her human form, however, when in her half-phantom form she acquires enhanced strength, speed, and agility. She is shown to be able to hold her own in combat against the Frog Phantom, however, is overpowered by a crowd of lesser Phantom at a train station. She also gains a very strong sense of smell and is able to pick up Yato's scent from a long distance away.