Drillboy

A soccer playing member of the Build Team that transforms into a drill tank or drill jet mode. As the youngest member in Brave team, he often acts childish, and gets scolded by Yuuta, or his teammates. He is a prankster, and loves to joke around. His main weapon his soccer ball, which turns into spiked soccer ball when used against enemies. When forming Super Build Tiger, Drillboy becomes the foot additions, torso addition and wings.

(Source: Wikipedia)