Ryuga Banjo is a main character in the tokusatsu series Kamen Rider Build. Initially introduced as a fugitive, Ryuga becomes a key ally to the protagonist, Sento Kiryu. He transforms into Kamen Rider Cross-Z and, at a climactic point in the series, also becomes Kamen Rider Cross-Z Evol, merging his powers with those of Evolto. Ryuga is known for his fiery personality, determination, and loyalty, playing a crucial role in battling against the series' primary antagonists.