Chief Miwa, alias General Harris in select international adaptations, commands Earth's military forces during the war against the Baam refugees. Defined by extreme xenophobia and opportunism, he exploits the conflict to pursue genocidal aims against the Baam species. His tactics prioritize extermination above protection, dismissing civilian casualties as acceptable losses and actively undermining peace initiatives.

He consistently clashes with the Daimobic Base team, specifically opposing Kazuya Ryūzaki's humanitarian methods. To advance his agenda, he attempts to seize control of the Daimos robot, falsely accuses the protagonists of treason, imprisons Kazuya, and defies United Nations directives to deploy indiscriminate weaponry.

His actions culminate in executing unarmed, wounded Baam survivors. This decisive moral transgression provokes Kazuya to physically assault him, resulting in his incapacitation. Subsequent exposure of his corruption and war crimes leads to his arrest and removal from command.

In non-canonical media like the *Super Robot Wars* series, he functions as an antagonist collaborating with other villains such as Muruta Azrael and SEELE. These portrayals maintain his genocidal ideology and often conclude with his demise, including perishing in combat during the *End of Evangelion* scenario.

Narratively, he serves as a human counterpart to the Baam antagonist Olban, illustrating moral corruption on both sides of the conflict. His actions consistently underscore themes of institutional bigotry and the perversion of military authority.