Aaron Warner is the main character in the book series Shatter Me.  He is the Chief Commander and Regent of Sector 45.
Aaron comes off as cruel and calculated, meticulous about his hygiene and wardrobe, and a detail-oriented perfectionist. He rules Sector 45 with an iron fist and can shoot a man dead without batting an eye. He is highly intelligent and is able to manipulate individuals for his own advantage. Due to his violent upbringing, Warner knows little about showing affection.