Gusto is a 14-year-old male from a wealthy family. Despite his affluent background, he serves as a crew member aboard Eri Shinkai's private cruiser, performing duties like waiting tables. He possesses distinctive purple spiky hair and brown eyes, typically dressed in a casual t-shirt and shorts. His role places him within Eri Shinkai's oceanographic expedition, where he assists the Treasure Hunting Club. Gusto aspires to become a salvager and deeply admires Aika Sumeragi, considering her his role model. His character involvement is confined solely to this specific narrative and does not extend to later franchise installments such as *Aika Zero*.