Masa Osoreya is a thirteen-year-old boy and one of the central characters in the anime Hero Bank. He dreams of becoming the greatest hero in the world and possesses a strong sense of justice, always standing up for what he believes is right, even when it means opposing his friends or teammates. His personality is energetic and consistently positive, which makes him well-liked among his peers. However, his idealistic nature sometimes comes into conflict with the harsher realities of the hero business, leading him to question whether he truly has what it takes to become a genuine hero. Despite these doubts, he never gives up and remains eager to learn and grow. In battle, Masa wields a powerful avatar named Gao, which grants him immense physical strength and the ability to control electricity. This combination makes him a formidable opponent, yet he does not rely solely on brute force; he also employs strategic thinking to outmaneuver his adversaries. He is highly knowledgeable about the world of Hero Banks and constantly seeks ways to improve his tactics. Masa values teamwork and collaboration, often taking on a leadership role due to his practical, goal-oriented approach and natural confidence. His relationships with his allies are built on trust and loyalty, and he is deeply committed to supporting those close to him. Throughout the series, Masa undergoes personal development as he learns to balance his idealism with practical challenges, ultimately growing into a more mature and capable hero.