Ouji Kousaka

Another one of Yukiteru's classmate, Ouji is in Yukki and Yuno's classroom during the previous semester and is one of the first people to betray him during the terrorist bombing incident. He writes down a list of all of his proudest accomplishments in a blog he dubs the "Kousaka King Diary", often using the phrase "I'm Shining!" after each sentence. (Source: Wikipedia)