Yukine is first portrayed in the manga as being a bit cold and cruel, although in the anime his coldness is toned down. He is clearly upset and annoyed at the fact that he died, and became Yato's weapon, complaining about staying with someone like him. As a result of this and the fact that people cannot see him well, Yukine takes advantage of this and other people, stealing money, clothes, and even betraying Hiyori. Yukine though seems to feel jealous over others who are alive, upset about the fact that he is dead and cannot make friends and learn what other students do. He is also apparently afraid of the dark. When Yato is forced to punish Yukine, Yukine confesses all of his sins and apologizes sincerely, and escapes the temptation that hurts Yato as his shinki.


Yukine is visibly more upbeat after his punishment, befriending Hiyori more and requesting to learn what she does in school. Yukine also is more dilligent in his work as Yato's shinki, working part time for Daikoku to earn money for the two of them.