O'aka XXIII is a non-player character in Final Fantasy X and Final Fantasy X-2. He is a traveling merchant who sells items and equipment to the player. He is Yuna's devout supporter and has a brother called Wantz.
O'aka has floppy red hair with a small black hat secured with string under his chin. He wears a short brown waistcoat that reveals his stomach under a blue shirt, baggy beige trousers, open sandals and gloves. He wears a pack of wares. Unlike most Spirans, O'aka speaks with a Cockney accent, like Wantz.
O'aka is at first pompous and rude, commenting on Tidus' clothes and income, but he proves himself a valuable asset later, being there when they need him and providing occasional discounts. O'aka can be sneaky, slipping past guards and security, but his motives to help Yuna and the party are close to his heart. Despite the disagreements they get into, O'aka does care for his brother Wantz. O'aka learned many of his skills, like silver-tongued negotiations and disguises, from his forebears.