Yojinbou, also known as 'Yojimbo' in English adaptations, is a summonable aeon featured in the Final Fantasy series, first appearing in Final Fantasy X. Known for his mercenary nature, Yojinbou is a samurai who offers his services for a fee, demanding gil to perform attacks. His most powerful move, Zanmato, can defeat almost any enemy instantly. Unlike other aeons, Yojinbou's actions depend on the player's payment, making strategic financial management crucial. His character adds an element of unpredictability and strategy to the game, reflecting themes of loyalty and honor.