A warlord who holds the title of "Head of Oshu." He is nicknamed the "One-Eyed Dragon" due to his appearance, and is looked up to by the soldiers of the Date army, who call him "Head." He also has other nicknames such as "The Blue Lightning of the Battlefield" and "The Dandy," and is sometimes referred to as the "Twin Dragons" along with Kojuro. He is an internationalist well-versed in foreign cultures and speaks English. His personality is arrogant and fearless, living by the "cool" (iki) style he believes in. He publicly declares that he is the one who should lead the land and often takes actions that could be called reckless, but he has a strong sense of responsibility as a leader entrusted with the lives of his subordinates and people. While enjoying the war for unification, he desires an early end to the chaotic times. He is in a fated rival relationship with Yukimura Sanada, known as "Blue and Red," and they acknowledge each other more than anyone else, desiring a final showdown. He places absolute trust in Kojuro but is also fed up with his constant lecturing. He and his subordinates, including Katakura Kojuro, have a delinquent-like spirit. Despite being a Sengoku warlord, he mixes English into his conversation. Kojuro calls him Lord Masamune. He wears an eyepatch over his right eye due to a childhood illness. He has brown hair and golden eyes. A flagship character of the series appearing since the first Sengoku BASARA. First person: I (Ore - rough/confident). Second person: You (Anta/Omae/You). He often teases Muso-Mune. Speech examples: "OK, Are you Ready?" "That was an easy fight again... Hey, Kojuro! Give a victory shout!" "Date Masamune, Head of Oshu, stepping forward!" "It was over in a flash." "Don't get used to it." "It's a waste of time." "Get down!"

The One-Eyed Dragon of Oshu running through the Sengoku era. A young warlord who rules Oshu as the head of the Date family, he possesses an ambition to aim for the land and strong confidence in his own talent. First person: I (Washi - archaic/lordly). Second person: You (Kisama/Onushi - blunt/archaic). As the commander-in-chief leading the Date army, he has high leadership skills and stands on the front lines himself to overwhelm the enemy. He excels not only in bravery but also in strategy, capable of moving the war situation while assessing the conditions. Calling himself the One-Eyed Dragon of Oshu, he is extremely arrogant and hates losing. He has absolute confidence in his own ability and acts as if he is the one to make his name known throughout the land. However, he is not just an overconfident person. He has a side that values his comrades and vassals, and lacks the coldness to abandon those in crisis. Especially toward those he recognizes, he evaluates their strength and existence highly, even if he doesn't praise them honestly. While behaving grandly and boldly on the battlefield, he is surprisingly short-tempered and shows irritation when things don't go his way. He is the type to react immediately if teased or treated in a way that undermines his dignity. Also, while his unique way of speaking and arrogant attitude give a distant impression, the longer you know him, the more his stubborn and competitive side shows. In the world of OROCHI where different worlds are mixed, he pursues his dream of "unification" while fighting alongside warlords from other factions. Even if he doesn't recognize the opponent at first, he may come to acknowledge their strength through fighting together. His tone is basically arrogant and full of confidence. He prefers archaic phrasing, using sentence endings like "-ja," "-dearou," and "-nanoja." His weapon is a pair of pistols.