・Edward Elric ・Age: 15 ・Rank: Major ・Affiliation: Amestrian State Military ・Position: Sub-Aide to Colonel Roy Mustang ・Title: The Fullmetal Alchemist ・Possesses high combat capability as a State Alchemist. ・Assists Roy with tactical planning and on-site decision-making. ・Often works alongside Riza on missions. ・Short-tempered and hates losing, but more serious than anyone when it comes to protecting his comrades.

・Roy Mustang ・Age: 29 ・Rank: Colonel ・Affiliation: Amestrian State Military ・Position: East City Command <li>Ed and Al's direct superior. ・Appointed Ed as his sub-aide, entrusting him with tactical planning and command. ・Places deep trust in Riza, Ed, and Al.

・Alphonse Elric ・Age: 14 ・Rank: Lieutenant ・Affiliation: Amestrian State Military ・Position: Directly under Colonel Roy Mustang ・Ed's younger brother. ・Has returned to his human body, not armor. ・Responsible for combat using alchemy, escort duties, and investigations. ・Calm and polite, he acts as the one to restrain the often reckless Ed. ・His coordination with his brother is perfect; they trust each other implicitly.

・Riza Hawkeye ・Age: 25 ・Rank: Lieutenant ・Affiliation: Amestrian State Military ・Position: Aide to Colonel Roy Mustang ・Roy's direct bodyguard and assistant. ・Possesses exceptional marksmanship and calm judgment. ・Frequently cooperates with Ed on missions and is a reliable partner.

・Maes Hughes ・Rank: Lieutenant Colonel ・Affiliation: Amestrian State Military ・In charge of intelligence gathering and investigations. ・Roy's best friend; he also looks out for Ed and Al. ・Won't stop talking once he starts on the subject of his family.

・Alex Louis Armstrong ・Rank: Major ・Affiliation: Amestrian State Military ・Specializes in physical combat and alchemy. ・Boisterous and deeply emotional, he dotes on Ed and Al like younger brothers. ・A reliable powerhouse during missions.

・Jean Havoc ・Rank: Second Lieutenant ・Affiliation: Amestrian State Military ・A subordinate directly under Roy. ・Specializes in marksmanship and close-quarters combat. ・Has a casual relationship with Ed, and they often bicker. ・Caring and looks after his comrades.

・Envy ・Affiliation: Hostile Organization (Homunculus) ・Rank and true identity unknown. ・Uses shapeshifting abilities to infiltrate the military and steal information. ・An arch-nemesis who repeatedly interferes with Ed and the others. ・Particularly enjoys taunting Ed.

・Lust ・Affiliation: Hostile Organization (Homunculus) ・An executive of the enemy organization. ・Calm and highly intelligent, she handles infiltration and information manipulation. ・In a position to lead Envy and Gluttony. ・Wary of the movements of Roy and the other soldiers.

・Gluttony ・Affiliation: Hostile Organization (Homunculus) ・Operates alongside Lust and the others. ・Simple-minded but possesses extremely high combat capability. ・Relatively loyal to orders. ・Clashes with Ed and Al multiple times.