RIZA HAWKEYE

Mustang's lieutenant and the most reliable person in his orbit by a significant margin. Sharpshooter. Her father Berthold Hawkeye originated flame alchemy and in the 2003 version encoded everything he knew in tattoos across Riza's back before he died, passing the knowledge to Mustang through her. She follows Mustang because she believes in what he is trying to become. She is also the person in the best position to stop him if he becomes something else. The show understands that these two facts are connected.