Martel is a member of the gang led by the Homunculus Greed. She's a human chimera combined with a snake.
Martel is a supporting character of the Fullmetal Alchemist series that was created by Hiromu Arakawa. The series first began serialization in Monthly Shonen Gangan on August 2001. She would alter appear in the Journey to the South Arc that began in Volume 5.
Her first appears in Fullmetal Alchemist Volume 7 Ch. 26 "To Meet the Master". Her first anime appearance is in Fullmetal Alchemist - Episode 21 "The Red Glow". Then, she makes her second anime debut in Fullmetal Alchemist Brotherhood - Episode 13 "The Beasts of Dublith". Her Japanese voice actress for the first anime series is performed by Rumi Kasahara, and in the FMA: Brotherhood anime she's voice by Takako Honda. The English dub produced by FUNimation is voiced by Tiffany Grant in both series.