Zero is the son of Ultraseven. He was trained under Leo after he was banished from the Land of Light by his father for attempting to take the Plasma Spark for himself. His training ultimately led to his redemption in his battle with Belial, who would become Zero’s archnemesis.

Luna-Miracle is Zero’s speed form, a byproduct of his fusion into Saga with Dyna and Cosmos, and is taken from their Miracle Type and Luna Mode respectively. It uses agility and enemy pacification.