Ichiro Oogami serves as the captain of the Imperial Combat Revue's Flower Division, a position he holds during the events of Sakura Wars: The Movie. His background is that of a naval officer who graduated at the top of his class from the Naval Academy, a distinction that reflects his sharp intellect and disciplined nature. He was originally chosen to lead the Flower Division after proving his capability during a test piloting a prototype Koubu, a type of steam-powered mecha. Before the timeline of the film, Oogami was dispatched to Paris to help establish and lead a similar combat revue, the Fleur Division. This assignment explains his relative absence for much of the movie's main conflict, as he is initially stationed overseas.

Oogami's personality is defined by a combination of military professionalism and genuine kindness. He is described as an honest, direct, and hardworking young man who is skilled in both literary and martial arts. Beneath his composed exterior lies a passionate and tenacious heart, taking his duty to protect others with utmost seriousness and showing a willingness to lay down his life for his comrades. While maintaining the toughness expected of a soldier, he is also a kind and sincere individual who listens to the difficulties of his team members, offering encouragement and earning their deep trust. This supportive nature serves as a catalyst that unites the strong-willed and diverse personalities of the Flower Division, fostering a family-like atmosphere. His role often extends beyond that of a tactical commander to that of a reliable counselor for his crew. In his daily life, when not in combat, he works humbly as a ticket taker at the Imperial Theatre, which serves as the division's base of operations.

In Sakura Wars: The Movie, Oogami's primary role is that of an absent leader whose presence is deeply felt. His transfer to Paris serves as a narrative catalyst, leaving the Flower Division under the temporary command of a new member, Ratchet Altair. While he is away, the division faces a threat from an American company deploying unmanned, demonic mechs called Japhkiels. Oogami's motivation throughout the film is to support his team from afar and return to them in their hour of greatest need. His key relationships are central to his character; he shares a particularly close bond with Sakura Shinguji, a primary member of his division, and his leadership has forged strong loyalties with all the original members, including Maria Tachibana, Iris Chateaubriand, Kohran Li, and Kanna Kirishima. He also maintains ties to his Parisian team, including Erica Fontaine.

Oogami’s character development is demonstrated by his return in the film's climax. He arrives precisely when the situation seems most dire, with the Flower Division overwhelmed and their spirit power depleted. His sudden appearance causes the main antagonist to lose composure, signifying Oogami's reputation as a formidable and inspiring leader. This event highlights his growth from a promising young ensign into a commander capable of turning the tide of battle and reinforcing the unity of his team across international lines. As for notable abilities, Oogami possesses exceptionally high spiritual power for a man, a key trait that allows him to pilot a Koubu effectively. He is a skilled tactician and commander, recognized for his sound judgment in battle. He was also bestowed the Shintou-Mekkyaku, one of four legendary spiritual swords, by a superior officer, marking him as a warrior of great significance. This sword, combined with his leadership and combat skills, makes him a formidable force in the final confrontation against the demonic mechs.