Movie
Description
Osamu Yamanami is a senior officer of the Earth Federation space navy in the anime Yamato yo Towa ni: Rebel 3199, where he holds one of the highest flag ranks and serves as commander of the special task force operating directly under the navy's director general, as well as the fourth captain of the battleship Yamato. He was born on April 4, 2150, and is fifty-seven years old when the story begins in October 2207. Within the larger remake continuity of the Space Battleship Yamato saga, he first appeared as a trusted subordinate of Captain Juzo Okita, later commanded the battleship Kirishima during the Garmillas war, commanded the flagship Andromeda as a fleet commander during the Gatlantis war, and eventually rose to commander in chief of the Earth Federation space navy before the events of this series.

Before his rise to high command, Yamanami was the principal of the space warrior training school attached to the Icarus Observatory, where he was responsible for training new Yamato crew members. He is portrayed as a professional junior to the legendary captains Okita and Tatsu Hijikata. In the 1980 film that this series remakes, he became captain of the Yamato during the invasion by the Dark Nebula Empire, led the ship to the enemy home world, and was mortally wounded on the bridge during the final battle. His dying words likened his own fatal injury to the breaking of a single part and urged the crew to continue without him, passing command to Susumu Kodai.

In the remake continuity, Yamanami's appearance was redesigned to show a pale complexion, a beard on his cheeks and chin, and a somewhat slender build. His personality is initially presented as optimistic, but later material establishes that this optimism is partly a public manner, and that he actually grasps reality in a dry, pragmatic way. Unlike Okita or Hijikata, he is not a charismatic leader who inspires through force of personality. Instead, he commands by recognizing the abilities of his crew members and finding ways to make those abilities work for the ship. This approach is visible in his conduct under pressure: when the Yamato suddenly emerges directly above an unfamiliar city after passing through a spacetime junction point, he immediately orders his crew not to engage, moves the ship into concealment behind the moon, and calmly works out how to avoid a needless conflict.

His role in the story is central to the Yamato's renewed mission. He is the officer who carries out the secret order to gather the disbanded former Yamato crew in 2207, after Dezarium forces occupy Earth and the military command structure is compromised. He welcomes Kodai and the returning veterans at the Icarus Observatory, where the rebuilt Yamato is being held, and under his command the ship launches and destroys an automated enemy planet with a new wave-motion cartridge weapon. He leads the voyage toward a future a thousand years ahead, and when evidence emerges that the Dezarium possession may carry a weapon capable of resetting human minds, he decides that the Yamato must go to the Dezarium home world to verify the truth behind the enemy's claims about history.

He also confronts an internal crisis during the voyage: many of the young people gathered for the mission become increasingly drawn to the Dezarium's dream of rewriting history. To deal with this, he goes alone to the ground to negotiate with the Japanese government, entrusting the difficult task of managing the unsettled young crew to Kodai. His request that Kodai see the mission through to the end as captain functions as a passing of trust from the older generation of officers to the next.

The key relationship in his story is with Susumu Kodai. Yamanami repeatedly places responsibility in Kodai's hands, first for the welfare of the younger crew and later for the command of the Yamato itself. He also works closely with Shiro Sanada, who shares his concern about the Dezarium, and commands a crew of veterans including Daisuke Shima and many of the former Yamato officers. His standing with the Earth government matters as well, since he must negotiate with civilian authorities while the Dezarium hold great influence over Earth politics.

Yamanami's development across the series shows a commander who carries the weight of both military duty and the protection of his people. His notable abilities are those of a leader rather than a combat specialist: swift assessment of unfamiliar situations, restraint in the use of force, skillful concealment and maneuvering, coordination of fleet operations against overwhelming odds, and the judgment to delegate critical decisions to younger officers. He is shown as a mentor figure whose arc is defined by preparing the next generation to take over, and his decisions set the course for the Yamato's journey through the spacetime junction point and the battles that follow.