Is the former Boss of the Gesso Famiglia and the current leader of the Millefiore Famiglia. Due to the actions committed by his future-self, he is considered the main antagonist of the Future Arc. In the present, he is chosen as Uni's representative in the Representative Battle of the Rainbow. 
Byakuran has spiky white hair and light purple eyes. 
He is very fond of sweet things, and he is almost always shown eating something sweet, especially marshmallows.