1. Literal Brotherhood: This refers to the bond between Edward and Alphonse Elric, the two main protagonists. They are actual brothers, and their relationship is the core of the story. They are deeply devoted to each other, willing to sacrifice everything for each other's well-being.
2. Philosophical Brotherhood: The series explores the idea of brotherhood extending beyond blood ties. This is seen in the relationships between:
* Edward and Roy Mustang: They share a mutual respect and a sense of camaraderie, working together towards common goals.
* Alphonse and the homunculi: Alphonse is a chimera, created through alchemy. He finds connections with the homunculi, artificial beings created by the same process, recognizing their shared experiences and struggles.
* The Elrics and other characters: They form bonds with various individuals, often becoming surrogate family members in a world that has caused them immense suffering.
3. The "Brotherhood of Man": The series also explores the concept of human connection and shared humanity, even amidst vast differences. This theme is prominent in the latter half of the story, as the Elrics confront the dangers of isolation and prejudice. They learn that everyone, regardless of their origin or beliefs, has the potential for both good and evil.
4. The Brotherhood of Alchemy: Alchemy is presented as a powerful tool that can be used for both good and evil. The Elrics' pursuit of the Philosopher's Stone, a powerful alchemical object, exposes the dangers of pursuing power without considering the ethical implications. The series raises questions about the responsibilities of alchemists and the limits of their power.
5. The Importance of Sacrifice: Brotherhood is often tested through acts of sacrifice, demonstrating the depth of their commitment to each other and to their ideals. The Elrics frequently risk their lives for each other and for the well-being of others.
In summary, brotherhood in Fullmetal Alchemist is a complex and multi-layered theme that represents the power of connection, the importance of shared humanity, and the responsibility that comes with wielding power. It is a central theme that drives the story's plot and characters, leaving a lasting impact on the audience.