An agent for hire in the war torn country of Gazth-Sonika. She is a part of Margaret, released after the horrible plane crash incident.
Action Girl: As the highest rated mercenary in Gazth-Sonika, this is a given.
All-Loving Hero: She's kind to everyone, sticks her neck out for people she barely knows, and only fights to bring an end to the war in Gazth-Sonika. A perfect example of this is when she's hired to publicly assassinate the commander of Gazth-Sonika's armies, Guen McNichol. When she's told that the target was also the person who commissioned the hit, she sneaks into his residence at night and, after discerning his motives, comforts him before leaving.
Anti-Hero: She's not a bad person once you get to know her, she'll stick her neck out for friends and even acquaintances, and she's only fighting to put an end to the war as quickly as possible, but she's still a mercenary— considered to be the very best (read: possessing the highest bodycount) in Gazth-Sonika— who kills hundreds without really batting an eye.
Dissonant Serenity: She's terrifyingly calm whenever she fights. Sometimes, she even closes her eyes.
Extraordinarily Empowered Girl: She has extremely honed combat instincts and, despite her young age, several years of hard combat experience under her belt, but aside from that she's pretty much normal. We find out later in the series that she's also immortal, but she still qualifies for this trope because her immortality really isn't any help in combat because it doesn't heal her fast enough, and while Madlax can't die, she can still lose. We've even deified her.
Friday Monday is the enigmatic founder and head of the Enfant Organization. Very little is known about his past before 1999, when he used his Gift to open the Door of Truth in a failed attempt to plunge the world into a total war, which, as he believes, is it's natural state.
Gainax Ending: His fate and that of Vanessa and Elenore have been the cause of some intense debates over if Margaret resurrected him or not.
Unlucky Childhood Friend: Sort-of, to Margaret. Poupee was another survivor of the plane crash, fell for Margaret, vowed to protect her... and died Taking the Bullet for her. His Gift kicked in and he sort-of lived on. Then, Friday took the amnesiac kid in and named him Carrossea, with his Poupee self remaining stuck at the Sanctuary.