Yukine

Yukine is one of the three main characters and one of Yato's Shinki. When the name Sekki is called, he transforms into a silver Ōdachi, the handle of which is loosely wrapped in bandages. After becoming a Hafuri Vessel (Blessed Regalia), his new Shinki form is that of two twin katanas, shorter than the original, but with the same design.

Appearance
In his human form, Yukine appears as a youthful teenager with short, messy hair. His hair is colored gold both in the anime and manga colorations. However, his eyes are reddish-orange in the anime and a yellow-amber in the manga. He is shorter than both Yato and Hiyori. His height is 147.4cm (or 4'10") according to the Animation Visual Book released for the anime. Upon his first summoning, Yukine wears a simple white robe, resembling a Japanese shinishozoku. He is later depicted with a blue hoodie, loose grey jeans, and teal patterned knit cap. In Episode 05 of the anime, he changes his attire to a white T-shirt, dark blue jeans, and a green knee-length jacket with a fur-trimmed hood. While as the manga progresses, his outfits are not always consistent and vary to all sorts given to whatever he is depicted with.

Personality
Yukine is first portrayed as being a bit cold and cruel. 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 of others who are alive, upset about the fact that he is dead and cannot make friends and learn what other students do. By then, he felt entitled to the pleasures of existing more-so than the living. He is also apparently afraid of the dark. When Yato is forced to punish Yukine through Ablution, 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 diligent in his work as Yato's Shinki, working part-time for Daikoku to earn money for the two of them.

Despite this, Yukine is still a bit sarcastic and occasionally yells at Yato when he is upset, especially after one of his few friends, Suzuha, dies. When Yato was missing, Yukine started to be more reserved, refusing to worry about Yato, as to suppress his feelings so he wouldn't hurt Yato via negative feelings. He instead busied himself learning how to be a better Shinki from Kazuma and tutoring from Hiyori. This shows that although Yukine still holds true to his sarcastic and edgy personality, he remains incredibly compassionate for those he forms bonds with. It has been shown many times how insecure Yukine truly is especially when the subject of Nora comes up. Despite being Yato's Blessed Shinki, he felt inferior to Nora and was jealous of her because she had been Yato's Shinki for much longer than him and even knew Yato's real name before he learned of it. He was relieved when he saw Yato release Nora as his Shinki. As his Lead Shinki, Yukine has shown to be very strict with Yato especially after Yato's declared his resolve to change his ways. Yukine's methods of dealing with Yato came off as harsh but it was for Yato's future that he treated Yato in such ways.