Martel

Martel (also spelled Marta) was a human chimera combined with snake. She was one of Greed's henchmen. She had the ability to stretch and twist her limbs.

Background
It is implied in the 2003 anime that Martel was a soldier in Ishval Civil War, though the manga states that she was critically wounded by a land mine in the recent Southern border war with Aerugo. She stepped on a mine and was taken to an army lab. There, she was combined with a snake. She escaped from there along with her friends Roa and Dolcetto.

Manga
In the manga Martel is first encountered in Dublith. She aids significantly in the capture of Alphonse Elric by getting inside his armor and stretching her limbs to impede his movements. In the raid on Devil's Nest she stays in Al's armor and survives the massacre. However when Greed, Martel, Roa, Dolcetto and Al try to escape through the sewer system, Führer King Bradley arrives to stop them. Roa and Dolcetto are killed almost immediately and Greed is defeated by Bradley. When Martel tries to kill the Führer for the murder of her friends, Bradley stabs her through Al's armor, killing her.

2003 anime
In anime Martel's role is slightly bigger as she survives the Devils Nest attack due to the Führer not being present in the Devil Nest's raid in the 2003 anime and she follows Ed and Al to eastern Amestris to seek revenge on the ones responsible for the deaths of Greed and her fellow Chimeras namely Solf J. Kimblee and the other Homunculus. She spies on Führer and Kimblee as they plan to destroy Lior. Martel finds out that Bradley is actually a Homunculus and tries to escape. Bradley follows and kills her in the same way as the manga, but not before she tells Al the truth about Bradley.

Trivia

 * Like Roa and Dolcetto, Martel is a brand of fine liquor.
 * Martel's tattoo appears magenta in the 2003 anime while in the second series, it's green.