Valiant is a robot build like Joey by humans to defend themselves from Demon Lord Master, Valiant is very advanced, had a lot of weapons, and can survive nukes, but unknown to humans, Valiant is controlled by the soul of V1, who remembers everything from his life. After The Star Incident, V1 now used his new robot body to protect the world with his brother Joey and also to improve his relationship with his brother.
C2A Fun Fact, he is inspired by Kiryu from Godzilla Franchise