Takechi Hanpeita (武市 半平太, Takechi Hanpeita) is the main antagonist and final boss of Ryu Ga Gotoku Ishin!/Like a Dragon: Ishin!. He is based on the real-life historical figure Takechi Hanpeita WP . He is the adoptive brother of the game's protagonist, Sakamoto Ryoma, and the founder of the Tosa Loyalist Party.