Idhi is a young girl who resides in the village of Hakodate and serves as the first person to encounter the protagonist, Akira, upon his awakening in a future world. Her discovery of him within a collapsed ruin sets the entire narrative into motion, as she and her father, Weir, pull him from the debris and take him into their care. Physically, Idhi is often depicted with short, blonde or light-colored hair and blue eyes, and she typically wears a dress. Her dark skin is another one of her notable visual characteristics.

In terms of personality, Idhi is characterized by her lively, curious, and exceptionally friendly nature. She is an affectionate girl who warms up to others very easily and demonstrates a remarkable lack of fear or intimidation. This trait is especially evident in her interaction with Akira; while the other villagers revere him as a god called Lord Omniscient because of his connection to the ancient ruin, Idhi treats him like any other person, showing no reverence or hesitation in his presence. Instead, she is openly interested in his past, his origins, and the forgotten era he represents. Her actions often demonstrate a protective and supportive nature, such as when she stands beside her mother to defend Akira against villagers who wish to report him to the ruling organization, OWEL.

Idhi's primary motivation stems from her inherent curiosity and her desire for connection. She is fascinated by Akira and the old world he comes from, eagerly seeking to learn more about him. Furthermore, she dreams of becoming a sharer, a role tied to the village celebrations known as Elsies, indicating a wish to be more deeply involved in the fabric and traditions of her community. Her role in the story is that of a crucial guide and a source of warmth for the displaced protagonist. As he navigates this unfamiliar future, Idhi acts as his first bridge to this new reality, showing him around the market and helping him understand how society now functions, such as the use of coins for trade and the control of information by OWEL. Her home and family provide Akira with his initial safe haven.

Her key relationships are central to her character. Her father, Weir, is the chief of Hakodate village, and her mother is named Taberina. The family lives together with a man named Vogt, who holds the significant role of Idhi's Elpa, a term used within the Elsie system to denote a non-biological father figure. Idhi shares a close bond with her parents, as seen when she and her mother firmly unite to protect Akira from the community's pressure. Her relationship with Akira is defined by her care for him; she worries about his health and headaches, and she is horrified when a visiting official named Cannith arrests her family simply for having found him.

Throughout the initial stages of the story, Idhi experiences a development from a happy-go-lucky village girl into a victim of the oppressive forces that govern her world. Her spirited nature is contrasted with the harsh reality of the OWEL organization, which she personally despises for its brutality, complaining to Akira that its agents enjoy beating people up. Her life is turned upside down when her father's brother, Vogt, secretly reports Akira's existence to the authorities, leading to her and her father being arrested and sentenced to death to cover up the discovery. This traumatic event marks a significant shift from her peaceful daily life to a state of peril, from which she is ultimately saved not by any action of her own, but by the sudden intervention of the android heroine, Dusk.

Idhi does not possess any supernatural or futuristic combat abilities. Her strengths are entirely social and emotional. She is notable for her courage, her empathetic nature, and her quick ability to form connections with others. Her primary function within the group is to serve as a representative of common humanity and warmth in a world that is often cold and controlled, making her a grounding presence for Akira as he begins his journey.