TV-Series
Description
Aiko Mary Harmony is a fifteen-year-old girl and the adopted daughter of Larry Harmony, a powerful businessman who owns Central Electronics, the largest electric company in Unit Blue. Growing up as the only child of a wealthy and prominent family, she resides in Gold Town, the affluent district of Unit Blue, and is surrounded by every conceivable luxury. Despite this privileged upbringing, Aiko is not portrayed as spoiled; rather, she is a sweet and loving individual who is deeply conflicted about the future that has been largely planned for her. She feels constant pressure to eventually succeed her father in running the family business, a path she, at her young age, is uncertain she wants to follow.

Aiko is a determined and highly idealistic girl who firmly believes in the inherent good within every person and that everyone deserves a chance. This core belief shapes her primary motivation throughout the story: to unite the other young individuals who, like herself, have been given Techodes. She is convinced that this shared experience means they all have something in common and therefore should be friends. While this persistent and earnest pursuit of friendship is often met with disagreement or reluctance from the others, Aiko is not easily discouraged and continues to reach out to them. Her role in the narrative is largely that of a bridge, acting as a friend to Arashi, a source of reassurance for Hajiki and Takumi, and a peacemaker for the more volatile Katana. She shares a particularly strong connection with the latter two, having the greatest impact on them.

Regarding her abilities, Aiko is a Techode owner, and she secretly possesses her own GAD, the mysterious black cubes that transform into giant mechanical beings known as Techodes. Her father is also deeply interested in these artifacts and is known to collect different GADs. While the specifics of her Techode are not detailed in the available information, her ownership of one places her directly within the central conflict of the world, and her father's collecting habits further involve her family in the events surrounding the Techodes.