Roy Mustang

Roy Mustang is one of the central characters in the Fullmetal Alchemist anime (both the 2003 series and the 2009 Fullmetal Alchemist: Brotherhood).

He's a high-ranking officer in the Amestrian military, holding the rank of Colonel (later promoted to Lieutenant Colonel and eventually higher). Known as the "Flame Alchemist", he is a State Alchemist who uses flame-based alchemy, snapping his fingers to create devastating explosions via oxygen manipulation and special ignition-cloth gloves (a signature technique).

In the anime (especially Brotherhood, which is the more widely watched and faithful adaptation), Roy is portrayed as:

• Charismatic, confident, and extremely ambitious — he openly aims to climb the ranks and become Fuhrer (leader of Amestris) to reform the corrupt military from within.
• Cool-headed and calculating in most situations, with a sharp intellect and strategic mind.
• A skilled leader who inspires loyalty in his subordinates (the "Mustang Unit" — Hawkeye, Havoc, Breda, Fuery, Falman, and later others).
• Outwardly flirtatious and laid-back (he has a reputation as a womanizer), but this is largely a calculated persona to mask his true seriousness and guilt over past actions (particularly his role in the Ishval War).
• Deeply caring toward his team and those he feels responsible for, though he hides much of his guilt and pain behind a composed exterior.

His defining trait is his immense power with fire alchemy (one of the most visually spectacular in the series), paired with a strong sense of justice and a willingness to dirty his hands to achieve a better future for the country.

Roy is widely regarded as one of the most popular and complex characters in the franchise for his blend of cool confidence, hidden vulnerability, and moral ambiguity.