"Ninja" is not in the list (ANBU, Celestial Beast, Chakravartin, Cooking-nin, Cyborg, Daimyō, Heavenly Sovereign, Hunter-nin, Jinchūriki, Legendary Creature, ...) of allowed values for the "Classification" property.Ninja
After being abandoned by his parents. Ryu went on to work for Orochimaru in return for his missions Orochimaru gave him the explosion release. More soon.