Tachihara is often seen as a hot-headed and impulsive individual, which often puts him at odds with his colleagues. Has an introverted, intuitive, feeling, and judging personality type. He is also described as reserved and introspective. Tachihara is prideful and doesn't like being underestimated or belittled. He also doesn't hesitate to kill, and sometimes urges others to kill people who are more trouble than they're worth.