A hotheaded and arrogant Ultra Warrior with a strong sense of justice, Zero is one of the many canon Ultras in Gaiden 3. 

For completely unnecessary reasons, I've extracted the voice of Zero's current official English voice actor, from a scene in Ultra Galaxy Fight: The Absolute Conspiracy, to give an example of how Zero talks, which can be found here. I also have a version of the file which was taken directly from the scene, which can be found here.