Celesia is an elf who appears as a supporting character in the anime Rune Soldier. She is known for her cheerful and friendly demeanor, often presenting herself as a helpful and good-natured individual. As an elf, she possesses a connection to the natural world and is sometimes referred to as a fairy, underscoring her magical and ethereal qualities.

In her first significant encounter with the main party, Celesia initially offers to assist the magician Louie in finding a branch from a special tree to create a new wand. However, this offer is later revealed to be a trap, as she leads the group into a dangerous situation within the elves' village. Despite this deceptive introduction, she becomes a recurring acquaintance and close friend to Louie, often joining the group on their adventures. Her close relationship with the main hero frequently becomes a source of jealousy for Melissa, a priestess who considers Louie to be her destined champion.

Celesia plays a supportive role in the story, appearing at various points to either request aid or lend her unique abilities to the party. For instance, she asks for Louie and the other main characters' help when strange weather phenomena begin to occur. She also joins the group on a mission to investigate a tower where a magician is conducting weather control research, assisting them through hazardous blizzards and hostile nature spirits. Her motivations are generally aligned with resolving supernatural disturbances and aiding her friends, though her initial introduction suggests a more mischievous or complicated side to her character. Her notable abilities are tied to her elven heritage, which allows her to function as a shaman with power over nature and spirits, making her a valuable ally in situations involving the elements.