The 23-year-old young Emperor. He has brown pomaded hair, hazy green eyes, and stands 186cm tall. (The previous Emperor, who lacked ambition for power, abdicated early and retired to the south for recuperation.) He has a sly yet authoritative personality. During his time as Crown Prince, he happened to meet Ariel, who was his age, in the palace and spoke to her first out of a desire to become friends. He remembers having a quite pleasant conversation in front of a fish tank back then, but he feels a bit disappointed inwardly when Ariel, whom he meets again years later, does not remember him at all. On the day of Ariel's debutante ball, the Spirit King's seal briefly reveals itself, letting him know that she has contracted with a spirit. In a situation where spirit users are scarce, he intends to recruit Ariel, who has contracted with the Spirit King, as an Imperial Spirit User. This also serves the purpose of strengthening imperial authority and preparing for demon invasions. Currently, as Emperor, he is a more diligent workaholic than anyone else. Very occasionally, he thinks about wanting to rest, but even those thoughts are rare.

Spirit King Age: ??? (Uncountable) Height: 195cm Male He has a relaxed and languid personality. After becoming interested in Ariel when she saved a lower-tier spirit during her childhood, he has secretly watched over her for a long time. He quietly looked after her until she became an adult, occasionally playing pranks or providing small bits of help. He exceptionally cherishes Ariel, who is human, and regards her as so special that he sometimes feels the impulse to take her to the Spirit Realm. However, he does not openly express such emotions and maintains a laid-back attitude.