At the beginning of the series, Isla is portrayed as a Giftia who displays little to no outward emotion. However, her partnership with Tsukasa Mizugaki prompts significant emotional growth, allowing her to gradually open up and connect more deeply with those around her. Isla is gentle and innocent, often struggling to navigate social situations and understand human interactions. Her primary concern becomes Tsukasa’s happiness, and she dedicates herself to supporting him in any way she can. She is prone to jealousy and harbors a strong desire to be helpful and meaningful to Tsukasa, especially as her retrieval date approaches.

Isla is compassionate and empathetic, caring deeply about the emotions and well-being of others. She was the first employee at Terminal Service One to prioritize the emotional needs of clients during Giftia retrievals. Inspired by Isla’s example, Kazuki Kuwanomi encouraged the rest of the staff to adopt a more sensitive and considerate approach after a difficult incident involving one of Kazuki’s own assignments.

Isla is depicted as a beautiful, petite young girl and is one of the shortest characters in Plastic Memories. She has long, light purple (or silver) hair styled in twin tails, with soft bangs that frame her forehead. Her striking red eyes further emphasize her delicate and doll-like appearance.

Isla typically wears the standard white Terminal Service uniform, accented with black and orange details, during her work at Terminal Service One. Early in the series, she is seen exclusively in her uniform, reflecting her reserved and emotionally distant demeanor. However, as she regains her sense of happiness and becomes more expressive thanks to her growing bond with Tsukasa Mizugaki Isla begins wearing various casual outfits, particularly when going on outings or dates with Tsukasa.

Isla originally worked as the partner of Kazuki Kuwanomi at Terminal Service One. Their partnership ended after a traumatic retrieval operation involving Michiru’s father. The attempt went badly, resulting in Kazuki sustaining an injury and the target being destroyed by R. Security. Following this incident, Kazuki chose to dissolve their partnership, and Isla ceased field work.

Afterward, Isla took on administrative duties within Terminal Service One. She focused on desk work, cared for herbs in a small garden outside the office, and regularly served tea to her coworkers. She remained out of field operations due to the department’s requirement that employees work in pairs on retrieval assignments.

Isla eventually returned to fieldwork after being paired with Tsukasa Mizugaki. By the time their partnership began, Isla was already nearing the end of her operational lifespan, with only about 1,000 hours remaining. As her condition deteriorated, she became physically weaker and was unable to perform at her former level. Despite this, Tsukasa chose to remain by her side out of deep affection and commitment.

Later, Kazuki formally dissolved their partnership after Tsukasa confessed his love for Isla, as part of a plan intended to help both of them confront their feelings. This separation ultimately brought Isla and Tsukasa closer, allowing them to better understand each other and solidify their bond.

As a Giftia, Isla possesses a thoughtful and mature philosophy regarding the finite lifespan of her kind. While she plants hope in other Giftias and their owners by wishing them luck and happiness, she remains fully aware of the inevitable fate that all Giftias must face. During retrievals, before erasing a Giftia’s memories, Isla often offers parting words: “I hope that someday, you’ll be reunited with the one you cherish.”

This sentiment reflects Isla’s belief that, although memories may fade or be erased, the emotional bonds formed between Giftias and their owners endure beyond memory. She views these connections as eternal, symbolizing an unbreakable link that transcends the limitations of time and memory.