The black hero. Was once an enemy of Sonsaku. During the suppression of Koutou by Sonsaku, Taishiji stood against Sonsaku's troops by himself. Seeing his grand battle, Sonsaku acknowledged Taishiji and accepted him as a part of his troops.
In the 'Commander File' publication in Dengeki Hobby Magazine, after coming under Sonsaku, Taishiji gathered his fallen soldiers and left the area. Many of those under Sonsaku thought that Taishiji had fled but Taishiji returned with his remanent troops. That event helped to boost his name.
Wields a giant steel halberd and also a skilled marksman. Even though he started as a surrendered general, Sonsaku has great trust in him, together with Shuuyu he joins the Kappa attack force led by Sonsaku.
In the initial settings, he had a color scheme closer to that of a Dom and had a pink/red mono-eye but on the time of his kit announcement his design is adjusted, certain parts changed and the mono-eye became green. For that the initial actor of Dom is changed to Rick Dom II and the initial nickname The burning hero was changed.
The model kit for Taishiji Dom includes a support mecha based on the MA-06 Val-Walo from Gundam 0083.