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!
Fighter of the Night Man.
Day Man, the Champion of the Sun, is also a Master of Karate and Friendship for everyone.