 Leader of the four, commander of the Strong Air Battalion, the air force.
Like his siblings, Harpuia's armor is based on his biological data origin, X, with thematic alterations. His armor is colored green, symbolizing his alignment with wind and lightning. His helmet is mounted with wing-like extensions that bear resemblance to a Valkyrie's helmet, and powerful wing-like thrusters are mounted on his back.
He wields two identical energy-based Sonic Blades.