Mysterious Yellow Guy (aka MYG) is a character from the youtube video, Agamemnon Counterpart.
MYG had yellow skin, orange wavy hair and nose, and ridiculously large hands. He appears to have some sort of light blue Turtle-neck shirt, he also wears purple pants. He also seems to be riding on a cloud with small wings.
The video Agamemnon Counterpart is 1:00 long video that shows what appears to show a childrens cartoon that could've been produced during 20th century. In the video, MYG and a small blue blob like creature approach to the screen as the text appears saying "Let's make a new friend." It then cuts to a boy with no facial features except a mouth and possibly a nose. (W.I.P)