Introduced as an energetic, boastful, and stubborn warrior, Zero was sent into banishment by Ultraseven after his failed attempt to steal the Plasma Spark. Zero was trained under Ultraman Leo and was forced to wear the Techtor Gear. When Ultraman Belial returned to the Land of Light and steal the Plasma Spark, Zero redeemed himself by defeating Belial and retrieving the Plasma Spark, at the same time learned of his origin as the son of Seven (セブンの息子 Sebun no Musuko). Although he retained his hotheaded traits, Zero slowly went through character development and matured as his roles in the Ultra Series progressed. After helping to defeat Belial's invasion attempt in another dimension, he founded Ultimate Force Zero (ウルティメイトフォースゼロ Urutimeito Fōsu Zero), dedicating to protect the universe from evil threats and wiping out remnants of Belial's former army.