Ralsei

Ralsei is very humble and kind, showing genuine care for the well-being of his friends to the point of selflessness. At the beginning of Chapter 1, Ralsei tries his best to befriend Kris and Susie in order to fulfill The Prophecy with them. Trying to be on good terms, he shows reluctance at getting angry and appears disappointed when Kris or Susie act mean. Nevertheless, Ralsei remains convinced that they have good in them and that fighting is not necessary in this world. His naivety almost costs him his life when he accepts King's fake-out surrender and heals him, allowing him to betray and defeat them. Ralsei learns from this to not always be so trustful of others.

Ralsei enjoys baking cakes, especially for his friends. This caring side sometimes shows up when he encourages Susie and Kris to do their homework, emphasizing the importance of education, indicating his responsible nature. Despite his occasionally bossy behavior, he is himself prone to being the one bossed around, especially by Susie. He becomes flustered when receiving gifts or affection, likely due to his past isolation and lack of familiarity with others.

Although gentle and shy, Ralsei is equally courageous, as he seldom retreats in the face of danger and displays no fear in life-threatening situations.

Ralsei also differs from other Darkners in that he is able to survive in any Dark World without turning to stone. He is also aware of the connection between a Dark World and the Light World, as he knows about the unused classroom and its connection to the Card Kingdom.

Castle Town is in the School's Closet Dark World. It houses Ralsei's Castle and the Fountain of Darkness. It is unique in its ability to host Darkners from other Dark Worlds.