After helping to defeat Belial's invasion attempt in another dimension, he founded Ultimate Force Zero to protect the universe from evil threats and wiping out remnants of Belial's former army. Ultraman Zero is voiced by Mamoru Miyano ( 宮野真守 Miyano Mamoru), whose known for his role as Setsuna F. In tribute to his voice actor, Ultraman Zero utters his pre-battle catchphrase, 'I am Zero, Ultraman Zero!' ( 俺がゼロ, ウルトラマンゼロ! Ore ga Zero, Urutoraman Zero!), which is based on Setsuna's infamous line, ' I am Gundam!'. In the English dub movies, he is voiced by Daniel Van Thomas. Movie producer Junya Okabe stated that Zero's involvement in Mega Monster Battle: Ultra Galaxy was to invoke the elements of a parent-child relationship.

Ultraman Zero's title as 'the son of Seven' laid a huge impact on the audience. The setting of Zero as Leo's pupil was made under suggestion of director Koichi Sakamoto incorporating elements of his favorite Kung fu films. His youthful and hot-blooded outlook is based on Joe Yabuki from Ashita no Joe while his fighting skills revolves around the combination of Ultraseven and Leo. In Ultraman Saga, a comical plot was suggested to the character as a new element and Zero's 5 meter-transformation is based on proposal made by VFX producer as part of an Ultra Warrior's relationship with humanity. Ultraseven Ax, the initial draft of Ultraman Zero as photographed in a special event in Tokyo Dome City during 2010. Ultraman Zero was designed by Masayuki Gotou under the initial draft name Ultraseven Ax ( ウルトラセブンアックス Urutorasebun Akkusu).

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