OVA
Description
Capitão Tokuhiro Iga is a central figure in the series, serving as the commanding officer of the submarine Blue Submarine No. 6. He is 41 years old and was born in Miyazaki, Japan.

Iga has a complicated and somber background that precedes his command. While serving in the submarine division of the Marine Self Defense Force, he struggled with alcoholism, a problem that ultimately led his wife and child to leave him. Determined to turn his life around, he swore to give up drinking and became an instructor at the International Naval Academy.

In terms of personality, Iga is portrayed as a cool-headed, calm, and collected individual, especially in the heat of battle. He carries a strong sense of responsibility and is fiercely loyal to his crew, often being viewed as a mentor figure by his colleagues. His demeanor is one of a natural leader who remains focused on the task at hand, rarely faltering under pressure. He has a practical approach to command and is known for trusting his crew to provide the latest intelligence, which he then quickly exploits to his advantage. His past struggles have instilled in him a disciplined and responsible nature, and he values duty and loyalty highly.

A key motivation for Capitão Iga is the need to confront the threat posed by the Verg, the mutated sea creatures created by the scientist Zorndyke. As a veteran of past battles against this enemy, including the conflicts in Musuca, he has firsthand experience with the danger they represent. This experience drives him to recognize and secure the best possible talent for his mission. He understands the exceptional abilities of Hayami Tetsu, a gifted former pilot, and it is Iga who pushes Hayami to overcome his reluctance and rejoin the Blue Fleet, believing his skills are essential.

Iga’s most significant relationship is with Hayami Tetsu, whom he personally recruits and mentors. He respects Hayami’s abilities and serves as a steady, authoritative figure who pushes the younger man to fulfill his potential. His role in the story is primarily as the leader of the Blue Submarine No. 6 crew, responsible for the lives of his subordinates and the success of their high-stakes missions against the Verg forces. As a captain, he is the strategic anchor of the operation, making critical decisions and maintaining the morale of his rag-tag group of crew members.

Regarding development, Capitão Iga is a character who has already undergone a significant personal transformation before the events of the story. His arc from a disgraced alcoholic who lost his family to a disciplined, sober, and respected captain of a critical warship is a central part of his backstory. In the present, he shows little of the personal turmoil of his past, instead embodying the qualities of a steadfast and reliable commander.

As a leader, his notable abilities are those of command and strategy. He is a highly effective captain who leads by example, inspiring loyalty and confidence in his crew. He is a veteran of submarine warfare and has proven himself in combat against the Verg, demonstrating the tactical acumen necessary to keep his vessel and crew intact through dangerous missions. His strength lies not in superhuman feats, but in his unwavering focus, sharp decision-making, and the respect he commands from those under his charge.