Eleking appears in Haitai Nanafa as a guest character from the broader kaiju girl humanization project. She is a young female character with a teenage appearance, characterized by her pink, neck-length hair and blue eyes. Her outfit in this series is a distinctive hoodie featuring a zipper pull shaped like an electrical plug, worn over a turquoise shirt.

In her role within the story, Eleking is a minor character who appears as part of a crossover event. She arrives at the home of the main character, Nanafa Kyan, alongside two other kaiju girls, Alien Temperor and King Joe. Their visit is made on the orders of another character named Lina, whom they regard as the greatest life form. During this scene, Eleking assumes a subservient position, notably carrying a fan for Lina while Alien Temperor speaks on Lina's behalf. The group’s purpose is quickly interrupted by the arrival of Alien Mefilas and Zetton, leading to their departure.

Eleking's personality and motivations are not explored in depth due to her brief appearance, but her actions suggest a loyal and dutiful nature as a follower of Lina. Her key relationship is with Lina, whom she serves, and she acts as part of a small group with Alien Temperor and King Joe. The character does not undergo any significant development within the narrative of Haitai Nanafa. Her design is noted to be a variation of a prototype design from the POP collaboration project. Eleking has no notable supernatural or combat abilities demonstrated in this series.