Mike Nawrocki is one of the most widely featured characters in the Rock Band franchise, having appeared in Rock Band, Rock Band 2 , Rock Band 3 , and being featured as a playable minifigure in Lego Rock Band. His name was not revealed, though, until the second installment in the Rock Band series . In every appearence, Duke of Gravity can be categorized by his signature light blue and yellow jacket and tight green pants. In every appearence he also wears large, circular goggles which obscure his eyes. He is also easily identified by his pink mutton chops and blue mohawk, though this look was slightly altered for his appearence in Rock Band 3 . He was originally known as Duke of Gravity.