Ryuga Banjou is a central character in the tokusatsu series Kamen Rider Build. Initially framed for murder, he becomes an ally to the protagonist, Sento Kiryu. Through his fierce determination and resilience, Ryuga transforms into Kamen Rider Cross-Z, and later achieves the form of Kamen Rider Great Cross-Z. As a passionate fighter, he supports Sento in their battle against Faust and other threats, gradually uncovering his own mysterious origins and playing a crucial role in the fate of the world.