Gainer Sanga is the main protagonist of the anime series 'Overman King Gainer.' Initially a reclusive and introverted high school student, Gainer becomes the pilot of the Overman 'King Gainer' and is reluctantly drawn into the Exodus, a mass migration movement seeking freedom from oppressive city governments. As the story progresses, Gainer evolves into a courageous and dependable leader, playing a pivotal role in guiding his companions through battles and helping them to achieve their dream of a new life.