Rei Amatsu is a prominent character in the anime series 'Monster Hunter: Ride On'. As a skilled Rider, Rei is known for his calm demeanor and strategic mind, making him a crucial member of the team. His bond with his Monstie, a Rathalos, is one of the strongest in the series, allowing them to face formidable foes together. Rei often provides guidance and support to the protagonist, Lute, and his friends, showcasing his leadership qualities and deep understanding of the Monster Hunter world.