TV-Series
Description
Kō Murakami holds the position of No. 4 Attacker in Border and is a key member of Suzunari First. He has a lean build, light skin, and distinctive upward-styled gray hair beginning from a widow’s peak that exposes his forehead. His standard uniform consists of a forest green jacket with black stripes, a black shirt, beige pants, and brown boots.

Murakami demonstrates discipline, diligence, and honesty, prioritizing team loyalty and undertaking difficult tasks to protect comrades, especially teammates. Polite and self-aware, he readily acknowledges his mistakes. His complex relationship with his Side Effect ability once made him despise it as theft of others' effort, but interactions with teammate Tatsuya Kuruma and mentor Arafune reshaped his view into seeing it as a tool to support his squad. Childhood and adolescent social isolation stemmed from this ability; friends grew jealous as he rapidly mastered taught skills, severing bonds. This pattern repeated at Border when he surpassed Arafune’s teachings within six months, fearing resentment. Arafune’s encouragement and Kuruma’s acceptance helped him embrace the Side Effect to strengthen his team rather than cause alienation.

His Enhanced Sleep Learning Side Effect absorbs and internalizes 100% of experiences after a short nap, directly incorporating them into combat skills. This enables terrifying growth rates, near-perfect recall of witnessed techniques, and rapid team coordination mastery, making repeated tactics against him ineffective. As an elite Border combatant, he wields Kogetsu and Raygust as primary Triggers, switching hands based on offense or defense focus. His Raygust defensive prowess is exceptional; high-level attackers struggle to breach his guard, especially when protecting allies. He supplements these with Triggers like Thruster for mobility or power, Senkū for reach extension, and Shield for concentrated defense.

Notable combat feats include holding off three powerful enemy Rabbits simultaneously during an invasion, significantly injuring two despite their difficulty for individual A-rank agents. In a structured 10-round match against Yūma Kuga, he leveraged his Side Effect to reverse an initial deficit into a 6-4 victory. Analysts heavily favored him in subsequent encounters, though opponents secured occasional wins through tactical planning. His observational skills counter unfamiliar threats, exemplified by neutralizing Yūko Kumagai’s Meteor traps through rapid analysis.

Murakami values genuine relationships, bonding with straightforward individuals like Masato Kageura despite the latter’s irritability and noting similarities between Kageura and Kuga. He maintains humility despite his rank, crediting success to his Side Effect and relentless training, and consistently prioritizes team success over personal glory, choosing to remain with Suzunari First for its sense of belonging and purpose. Trivia notes his name meaning "steel," preference for zaru soba and white rice, and status as a Fūjin candidate.