Mal Duncan, currently known as Vox (also known as the Guardian, Hornblower, and the Herald), is a fictional character, existing in DC Comics' main shared universe. He made his first appearance in Teen Titans #26 (March/April 1970), and is DC's first Black superhero. Mal Duncan did not have any powers, devices or costume until Teen Titans #44 (November 1976). Prior to that, John Stewart was introduced as a Green Lantern (and the designated substitute for Hal Jordan) in Green Lantern #87 (December 1971/January 1972). However, Stewart's appearances were sporadic until Green Lantern #182 (November 1984), when he temporarily became that title's primary character. Additionally, future Legion of Super-Heroes member Tyroc was introduced in Superboy #216 (April 1976).
Malcolm "Mal" Duncan saves the Teen Titans from a street gang called the Hell Hawks by beating their leader in a boxing match. Recruited by the Teen Titans, Mal feels unworthy due to his lack of abilities, and stows away on a rocket flight, which nearly costs him his life. After a time, Mal discovers a strength-enhancing exoskeleton and the costume of the Guardian. Using these, he becomes the second Guardian.
After assuming the Guardian mantle, Mal fights Azrael - The Angel of Death. Believing it to be a hallucination, Mal is surprised to awaken with the mystical Gabriel's Horn. Having defeated Azrael, Mal is permitted to live, provided he never loses another fight. The horn grants Mal unspecified powers, whenever the odds are against him in battle. Armed with the horn, Mal assumes the name Hornblower.
Mal soon returns to his Guardian identity, claiming that too many people knew he was Hornblower. In truth, the Horn had been stolen. He marries Karen Beecher (Bumblebee), before moving to California. He is an accomplished jazz musician and owns a nightclub named "Gabriel's Horn".
Read more about Vox at Wikipedia ...
Official Site: DC Comics
Links: Wikipedia - Mal Duncan/Vox Titans Tower Cosmic Teams