Mr. Leonhart is the father and trainer of Annie Leonhart. He comes from the same hometown that she, Reiner Braun, and Bertolt Hoover are from, and is somehow associated with the Titan workings outside the Walls. He relentlessly trained Annie to fight, using mostly kicks and the attacker's weight against them. Memories of his pleas for forgiveness later create an opening for Annie to crystallize herself before Eren Yeager has the chance to capture her.