He-Man and the Masters of the Universe (1983)

Man-At-Arms - given the "real name" of Duncan - despite being a soldier and a master of weapons is primarily peaceful and prefers alternatives to fighting. Though his stature suggests a warrior his character is primarily patterned after skilled mechanics and he likes to pass the time working on all the kingdom's vehicles. He is also Teela's foster father, as well as mentor to Prince Adam. The Sorceress of Castle Grayskull asked Man-At-Arms to adopt Teela because she felt that she could not raise her daughter and protect Castle Grayskull at the same time, and believing that if others knew of Teela's true destiny, it would make her daughter a target.

Man-At-Arms wears armor which is slightly different from that of the standard uniform of the royal guards. Duncan is also one of the three people who know He-Man's secret identity.