Shima Yousuke is a master of water sports from Ishigaki Island whose dream is to invent functional artificial gills. His background gives him exceptional balance, stamina, and control in aquatic environments, making him the team's water specialist.

As Dyna Blue, Yousuke fights with fluid movement and strong battlefield awareness. He utilizes the Surf Jet vehicle, the Attack Board, and Blue Frisbees, allowing him to attack with speed and precision while maintaining a mobile fighting style.

His Dynarod fires the Blue Water Whirlpool, a technique that reflects his connection to water and motion. Whether on land or near the sea, Yousuke brings adaptability, athletic confidence, and inventive thinking to Dynaman's battles against the Evilution Empire.