Kamen Rider G4 is a fictional character from the Japanese tokusatsu series Kamen Rider. He is part of the Kamen Rider franchise, which features heroes who transform to fight against evil forces. G4 is known for his unique armor and advanced technology, which sets him apart from other Riders. G4 first appeared in the series Kamen Rider Agito as a mysterious figure. Unlike other Riders, he operates independently and is often seen as a vigilante. His character adds depth to the storyline, showcasing themes of justice and the consequences of power.