Koito Otonoshin is one of the standout characters in the Japanese anime series Golden Kamuy, which originally premiered in April 2018. The show, adapted from a manga by Satoru Noda, centers around Saichi Sugimoto, a veteran of the Russo-Japanese War, who ventures into Hokkaido in search of a legendary hidden treasure. Along the way, he gathers a diverse group of allies—and among them, Koito Otonoshin emerges as a particularly memorable figure, especially after his debut in the second season of the anime. Fans quickly warmed to Koito, and it’s not hard to see why.

Now, let’s talk about Koito Otonoshin himself. He’s a young soldier in the Imperial Japanese Army, just 19 years old, yet already commands respect due to his discipline, skill, and quiet competence. When Sugimoto and his team cross paths with him, they’re immediately struck by his calm demeanor and sharp abilities—especially his expertise in martial arts and marksmanship. At first, Koito is hesitant to get involved in their mission. But over time, he becomes an indispensable part of the group, proving himself as both a capable fighter and a loyal companion. His journey from outsider to trusted ally is one of the more compelling arcs in the series.

What makes Koito Otonoshin so intriguing isn’t just his combat prowess—it’s his depth. There’s a mystery surrounding his past, his motivations, and even his personal beliefs. This air of secrecy adds layers to his character, making viewers eager to learn more. As the story progresses, we see Koito slowly open up, learning how to trust others and rely on teamwork, despite his naturally reserved nature. Even in the chaos of war, he holds onto a strong sense of justice and honor, which really sets him apart.

It’s also worth noting that Koito Otonoshin seems to embody many traits associated with the ISTJ personality type—often referred to as “The Logistician.” He’s introverted, thoughtful, and highly observant, preferring to assess situations carefully before acting. His dedication to duty, loyalty to his comrades, and methodical approach to problem-solving all line up closely with the ISTJ profile. He pays close attention to details, relies heavily on facts and logic, and values structure and order—hallmarks of someone with a judging preference in the Myers-Briggs system.

But like many ISTJs, Koito Otonoshin struggles with emotional expression. He tends to keep his feelings locked away, focusing instead on practical outcomes rather than interpersonal connections. While this makes him efficient and dependable, it also creates internal tension, especially as he begins forming bonds with Sugimoto and the others. Still, his growth throughout the series shows that beneath that stoic exterior, there’s a deep well of care and commitment.

From an Enneagram perspective, Koito Otonoshin fits the profile of Type Six—the Loyalist. This type is known for being cautious, security-oriented, and deeply loyal to authority figures. In Koito’s case, his allegiance to his commanding officer, Tsurumi, is absolute. He follows orders without hesitation and consistently puts the safety of his unit above his own. Whether it’s volunteering for dangerous missions or preparing multiple backup plans, Koito’s actions reflect a constant awareness of potential threats.

That said, this loyalty can sometimes tip into blind obedience, causing him to suppress his own doubts. His anxiety and tendency to anticipate worst-case scenarios are classic signs of a Six. He’s always scanning the environment for risks, analyzing power dynamics, and staying alert to any sign of betrayal. While this vigilance keeps him and his team safe, it also weighs on him emotionally.

All in all, Koito Otonoshin stands out as a complex, multi-dimensional character whose presence enriches Golden Kamuy in meaningful ways. Whether you’re drawn to his quiet strength, his moral compass, or his psychological depth, there’s no denying that Koito Otonoshin leaves a lasting impression. And while personality typing isn’t an exact science, the evidence strongly suggests that Koito Otonoshin aligns with both the ISTJ temperament and the Enneagram Type Six—making him a fascinating study in duty, loyalty, and inner conflict.