Diamond Derek was on the yellow team with Pink Sheep, NetherBoi ,and TuttoeGaming in the first round of egg wars during the video "The minecraft gods have answered!" They won that round, and Pinksheep claimed "This is one of the best squads I have ever had because they won the game without me even being there! I am so proud of my homies right now! My mustache is also very proud!" Due to being called a "homie" we must assume that he is a prankster gangster.
Screenshot 2016-08-17 10.46.40