Doji, known as Daidoji (大道寺, Daidouji; Daidoji) in Japan, is a recurring antagonist in the Metal Saga. Though not being the primary antagonist of Metal Fusion or Metal Fury, he is still a major antagonist, and would later become the main antagonist of Shogun Steel. He is the only major antagonist in multiple seasons.

He was an enemy of Gingka Hagane and the former leader of Dark Nebula who had Ryuga. He used to own Dark Wolf DF145FS before it got broken. Doji seeked the power of the "Forbidden 