Snake Yuki is one of twelve guardian angels serving Gorō Mutsumi, each a reincarnation of his deceased pets. She was once a white snake who perished in a fire, leaving her with lasting pyrophobia. Her name "Yuki" (snow) reflects her white skin and scales. As a Senior guardian angel, she maintains her calm, quiet demeanor while serving as a maternal figure to younger angels and offering valuable advice. Known as "Hebi no Yuki," she is associated with the color blue and possesses black hair and olive eyes.

During the series' second season, Yuki ascends to goddesshood, replacing the previous deity who violated divine rules. This grants her enhanced power and a strengthened resolve to support the sage's dream. Her responsibilities broaden to overseeing the world, focusing particularly on animal protection and continuing her guardianship of Gorō. Yuki is the bride to Gou, the Azure Dragon (Seiryu). Her journey involves overcoming the fears rooted in her traumatic death and adapting to her expanded divine duties.