Gasto Turbolance is a supporting character in the anime Agent Aika, serving as a friendly rival to the protagonist, Aika Sumeragi. He works as a salvager, a common profession in a future where much of the world, including Tokyo, lies submerged underwater.

Coming from a background of financial comfort, Gasto is the son of a company president. Despite his family's wealth, he chooses not to rely on that privilege and instead strives for independence by earning his own living as a salvager. This decision highlights a desire to prove his own competence and self-reliance through his chosen career. Gasto is a tall young man with a slender build, dark skin, and short black hair, often seen wearing a white uniform.

In terms of personality, Gasto can initially appear brash or impulsive, but he is also a highly skilled operative in his field. A defining and persistent trait is his romantic interest in Aika. He is described as a Casanova figure and regularly asks her out on dates, particularly for dinner, though his advances are consistently refused. Despite this rejection, he does not harbor any ill will and continues to cross paths with her during various missions.

Gasto's role in the story is primarily that of a rival salvager and a secondary ally. He works for a different salvaging company, which sometimes puts him in direct competition with Aika for the same bounties or treasures. His skill as a salvager is such that he occasionally manages to claim a reward right from under Aika's nose, showing up at the right place and time to secure the prize. However, this rivalry is not malicious. On several occasions, he puts aside their competition to assist Aika in her more dangerous missions, acting as a helpful ally when the situation demands it. His dynamic with Aika is a blend of professional rivalry and one-sided romantic pursuit, making him a recurring and dependable figure who provides both support and lighthearted competition. Beyond his persistent courtship of Aika, his motivations are largely tied to his work as a salvager and proving his own capability as an independent professional. He does not undergo a significant dramatic transformation throughout the series but remains a consistent presence as a friendly rival. His notable abilities lie in his skills as a salvager, which include piloting, underwater operations, and combat, making him a capable and resourceful competitor to Aika.