Aaron Warner Anderson is the main character alongside Juliette, and the short-term antagonist in the Shatter Me Series. He is the son of Supreme Commander Anderson and Leila Warner and the half-brother of Adam and James Kent. He is the Chief Commander and Regent of Sector 45.

Warner 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. As a result, his soldiers see him as a sick, twisted psychopath.

Despite his reputation, Warner shows his humanitarian side when he visits civilians at their homes, showing concern for their problems and trying to fix them. His childhood experiences have left him with zero tolerance for domestic abusers and a willingness to take action against them.