Nangou Kousaku is a native of Kyushu whose dream is to improve plant breeds through science and invention. His work reflects a practical, earth-focused approach to progress, rooted in growth, endurance, and hard work.

As Dyna Yellow, Kousaku serves as one of the team's strongest physical fighters. His combat style favors heavy impact, close-range pressure, and powerful finishing strikes. He is armed with the Chain Crushers, which allow him to bind, strike, and smash through enemy defenses.

His Dynarod fires the Yellow Thunderlight Fall, adding explosive force to his already powerful fighting style. Dependable and sturdy, Kousaku gives Dynaman the grounded strength needed to withstand the Evilution Empire's escalating attacks.