Faker is an evil duplicate of He-Man and serves his evil master, Skeletor.
“Appearing in the early episode “The Shaping Staff,” Faker appears as an exact physical replica of He-Man with the same skin tone and armor as the real He-Man, the only physical differences being glowing eyes and a hollow-sounding voice.”
I have embedded the He-Man episode farther downthread.
There are two different versions of Faker.
The first version is a blue skinned robot replica of He-Man.
The second is a magical creation, an exact replica meant to fool the people of Eternia.