Roy Mustang/Live-Action

Appearance
Roy returns the same exact appearance as he does in the Manga, although he is seen wearing his coat much more frequently than in both the Manga or Animes.

Personality
Roy's Personality is no different than his anime/manga counterparts, most likely to the film just being a direct adaptation of the Manga/Animes.

Edward Elric
Officially, Mustang is Edward's superior officer, but their relationship is far from the typical professional connection. There exists between them a sort of amicable animosity, as Roy takes a great deal of personal pleasure in teasing Fullmetal and watching him squirm under his orders and, at the same time, Ed takes pleasure in getting around his orders and showing Mustang up whenever he manages to find an opportunity. Though their meetings are fraught with a great deal of apparent, mutual dislike, Flame and Fullmetal hold a great deal of respect for one another and are compatriots as well as co-conspirators in the secret battle against the Homunculi. Having originally scouted the young boy for the State Alchemist program and formed a bond with him, Roy genuinely wishes to see Edward fulfill his goal and Edward also subtly supports Mustang's secret bid to become the Führer and improve the country. Their personalities are quite similar, both being quite fond of boasting of their own abilities, but willing to do anything to protect their loved ones.

Riza Hawkeye
Easily the most significant of Roy's personal relationships, his connection with Lt. Hawkeye goes deeper and further back than any other. The daughter of Berthold Hawkeye, the man who taught Roy to use alchemy, Riza has known Roy throughout his youth and military career and has a personal stake in how he chooses to live his life. In turn, Roy has entrusted Hawkeye with his life as his personal assistant and bodyguard and has deemed her as both his conscience and executioner by giving her the express authority to shoot him in the back should he ever step off the righteous path.

They repeatedly demonstrate a deep, genuine sense of concern and devotion to each other as equals. Roy has stated many times that Riza is "truly kind" and "sweeter than she seems", although he's often seen complaining about Hawkeye being demanding and too stern with him. He enjoys teasing her at any given opportunity, especially at the times she shows her affections openly. He also has a tendency to act on impulse whenever Riza is in danger.

Though their relationship has not shown any explicit signs of crossing into traditional amatory during the series, there have been many scenes where such a romantic nature is implied.

Maes Hughes
Mustang's best friend from their shared days at the military academy, Maes Hughes is Roy's closest friend inside and outside of the military. Almost constantly calling Roy on the phone or dropping into his office to say hello, Maes' uplifting persona is an active deterrent to Colonel Mustang's often gloomy disposition. Maes is also the strongest secret supporter of Roy's bid for Führer, often giving him inside information from his position in the investigations office at Central Command as well as slipping him pointers on how to achieve his dream. Though Roy often receives Hughes with disdain and annoyance, when Maes is mysteriously murdered, Roy is overcome with grief and rage to the point that he becomes almost obsessed with finding his friend's killer.