Day Man is a fictional character from a song created on the television series "It's Always Sunny in Philadelphia". Day Man is the champion of the sun, he is a master of karate and friendship for everyone. He is also the arch nemmesis and fighter of the Night Man
Dorothy: Have you heard of the Day Man
JB: Hell's yeah girl, he's the fighter of the Night Man, he's a master of karate and friendship for everyone!
Night Man is a fictious character from a song used in the television series "It's Always Sunny In Philadelphia". In the song he is portrayed as a mystical figure empowering a mortal man. How ever the lyrics seem to suggest more that he is a homosexual that rapes other men.
"They took you Night Man and you don't belong to them. They left me in a world of darknes with out your sexy hands and i miss you Night Man, so bad."