Barrel

Baryl, known as Barrel in Japan, is the adopted son of Wily in the Mega Man Battle Network series and the operator of Colonel.EXE.

He is a former Supreme Commander of Netopia's Network Corps. While in the forces, he managed to achieve victory in a battle against unsurmountable odds, as a result he became known as the "Invincible Baryl" (ふじみのバレル/不死身のバレル Fujimi no Barrel)

(Source: Megaman Wiki)