Barrett is a supporting character in the anime series Glass Fleet, known for his role as a skilled pilot and a member of the crew aboard the glass battleship. He is initially introduced as one of the original crew members serving under the ship's captain, Cleo of the Wind, alongside fellow crewmates Eimer, Nowy, and Heizak. Barrett’s background is marked by a significant past in the Imperial Navy, where he once served as a high-ranking officer and was a pilot in the glass fleet. However, he became disillusioned by the corruption and violent actions of the empire, leading him to defect from his position and join Michel Volban's rebel forces. Before this, he also served as the captain of a ship called the Rustica, which was eventually destroyed over the course of the series.

In terms of personality, Barrett is portrayed as a mysterious and aloof individual who often maintains a cold and distant demeanor. He is not one for social interaction and tends to keep to himself, which can make him appear blunt or even rough to those who do not know him well. Despite his reserved and sometimes gruff exterior, his skills as a pilot and a strategist are described as unmatched, making him an invaluable asset to his allies. His defection from the empire highlights a strong moral core, as he chose to fight against a system he found unjust, and he demonstrates a deep sense of loyalty to his chosen cause and comrades.

Barrett’s primary role in the story is as a combatant and pilot who contributes his considerable experience and tactical knowledge to Michel's People's Army in their struggle against the self-proclaimed Holy Emperor Vetti. He is part of the diverse team that operates the powerful glass battleship, participating in key battles and missions. His history as an imperial officer gives him a unique and valuable perspective on the conflict, as he understands the inner workings and capabilities of the enemy they are fighting.

Throughout the narrative, Barrett undergoes noticeable development. While he initially keeps a strict emotional distance from those around him, he gradually begins to open up. He forms closer bonds with his allies in Michel's fleet, and at one point, he even falls in love, indicating a significant softening of his previously detached character. This evolution shows a man moving from a place of isolated disillusionment to one of renewed connection and purpose. As a notable ability, Barrett is recognized for his exceptional piloting skills and his tactical acumen, which are repeatedly demonstrated as he navigates the dangers of space combat and contributes to the strategic efforts of the rebel fleet.