Icillia Pearlant is a character from the anime series The Villainess Is Adored by the Prince of the Neighbor Kingdom. She holds the title of the daughter of the Pearlant Duke, placing her within the nobility of the kingdom. Her role in the narrative is distinctive, as she is identified as the protagonist of a sequel to the otome game that serves as the basis for the story's world.

Icillia is described as having a calm and gentle personality, which forms the core of her demeanor. A notable aspect of her character is that she has no experience with love, a trait that contributes to her personal journey within the plot. Her connections to other characters are significant, particularly regarding the story's central couple. Prince Aquasteed Marineforest, the crown prince of the neighboring kingdom and the main love interest, is known to go out of his way to keep Icillia happy. This behavior stems from her unique connection to the water fairies, which creates a Fisher King-type situation where the fairies might cause a storm if they believe she is upset.

This dynamic inadvertently causes emotional complications for Tiararose, the reincarnated villainess-turned-protagonist, as she observes Aquasteed spending considerable time attending to Icillia without an initial explanation for his actions. Icillia herself is shown to be proactive in resolving the conflict that arises from her connection to the world. In one episode, she actively tries to uncover the reason for the Sea Fairy King's animosity toward Tiararose. During this endeavor, she encounters an unexpected temptation, suggesting she faces her own personal challenges and moral choices within the story.

The character appears in the anime adaptation of the light novel series, where her voice is provided by Marina Yamada.