Lunar Month

A chimera is an alchemical cross between two different beings to create an entirely new one. While the vast majority of chimera seen in Fullmetal Alchemist are a cross between two animals, some are humans that have been crossed with an animal. These experiments, performed in secret by the State Military, endow the human with abilities reminiscent of the animal.

Bido is one of the many chimera to work with Greed. He was a soldier of the State Military who was turned into a chimera; in the anime this was done to keep him quiet about his secret missions, while in the manga it was because he had been heavily wounded. Bido was crossed with a lizard, allowing him to sneak around and climb surfaces with ease. Because of this he is tasked primarily with intelligence gathering and relies on others to defend him. In the anime, he is killed during the military's attempt to capture Greed. In the manga he is the only chimera to survive. Upon hearing of someone named Greed in Central, Bido goes there to see if it is his master. There he encounters Lin Yao, the new Greed, who, having no recollections of Bido, kills him. Nevertheless, Bido's death brings back the former Greed's memories and causes him to follow his predecessor's footsteps by betraying the other homunculi.

Darius and Heinkel are introduced in the manga as two of Zolf J. Kimblee's bodyguards. They are instructed by Kimblee to help him fight and apprehend Edward Elric. When Kimblee shows no interest in their safety and Ed subsequently puts himself in harms way to save them, they side with him instead. Darius can transform into a humanoid gorilla, while Heinkel can transform into that of a lion.

Dorochet is one of the many chimera to work with Greed. He was a soldier of the State Military who was turned into a chimera; in the anime this was done to keep him quiet about his secret missions, while in the manga it was because he had been heavily wounded. Dorochet was crossed with a dog. As such he displays a number of dog-like tendencies, such as lifting his leg when going to the bathroom and being loyal to Greed to a fault (he notes this to be a particularly irritating quality). He is killed by the homunculi while trying to defend Greed; in the anime he is killed by Lust, while in the manga he is killed by Wrath.

Jelso and Zanpano are introduced in the manga as two of Zolf J. Kimblee's bodyguards. They are tasked with capturing Scar. Though they serve Kimblee because they have abandoned the ideas of living normal lives, Alphonse Elric and Scar's other companions convince them not to give up hope. As such, they decide to join sides with Scar's group instead. Zanpano can transform into a humanoid boar, while Jelso can transform into a humanoid frog-like creature.

Loa is one of the many chimera to work with Greed. He was a soldier of the State Military (once serving under Alex Louis Armstrong) who was turned into a chimera; in the anime this was done to keep him quiet about his secret missions, while in the manga it was because he had been heavily wounded. Loa was crossed with a bull. He is able to transform into a bull-human hybrid, giving him horns and greater strength. His primary weapon is a hammer. He is killed by the homunculi while trying to defend Greed; in the anime he is killed by Lust, while in the manga he is killed by Wrath.

Martel is one of the many chimera to work with Greed. She was a soldier of the State Military who was turned into a chimera; in the anime this was done to keep her quiet about her secret missions, while in the manga it was because she was severely injured by a land mine. Martel was crossed with a snake, and thus can stretch and contort her body to great effect. She uses this ability during her introduction to infiltrate Alphonse Elric's hollow armor body and control it from the inside. She remains in Al's body for much of her role in the series, the most prominent reason being that she is safe while in there. In the manga, Martel is killed during King Bradley's attempt to capture Greed; shes tries to use Al's body to kill him for slaughtering her fellow chimera, only for Bradley to cut through Al's armor to get her. Her primary role occurred after she was killed, when her blood splattered across Al's blood seal jogged the memories of his time at the Gate, and thus enabled him to use Alchemy without a transmutation circle like his brother. In the anime Martel survives this raid and accompanies Al in his various endeavors. She is ultimately killed by Bradley in much the same way as in the manga, though not before informing Al that Bradley is a homunculus.