Lust

Lust (Japanese:ラスト, Rasuto) is a Homunculus and one of the first antagonists in the Fullmetal Alchemist series. Lust is the first Homunculus to appear in the series and plays a significant part in the plots of both the manga and 2003 anime series, usually partnered with Gluttony to whom she appears to have a particular, almost motherly closeness. Her Ouroboros mark is located on her collarbone, just above her large breasts.
Though named for the vice of lust, Lust does not appear to be lascivious herself, but rather an object of lust for others. Due to her enticing looks and high intelligence, Lust easily and effectively plays the role of manipulator within the Homunculus ranks, moving covertly around the country to lure weak-minded people (usually alchemists) into the clutches of Father to be used and disposed of when no longer needed.

Aside from her skills as a infiltrator and puppet-master, Lust has the usual Homunculus abilities of incredible longevity, astonishing regenerative capabilities and a great resistance to death that borders on immortality. Her own unique ability is to extend her fingertips into long, thin blades sharp enough to cut through just about anything with ease. The length to which her fingers are able to stretch has not been shown to have any particular limit as well, earning her the nickname "Ultimate Spear" among her Homunculus peers.
In the manga, Lust is the only female Homunculus and the second to be created by Father, apparently made from his lustful emotions and souls from the dead nation of Xerxes. Due to her high intelligence and devotion to Father's plan, Lust appears to have a great deal of free reign and authority within the organization, seeming to have a position second only to Pride and on par with Wrath. Lust also has a great disdain for humans, thinking them frail, predictable and generally stupid. Moreover, she appears to take pleasure in using and throwing them away. Lust is the first to introduce the idea of Homunculi as superhuman, the next wave of evolution of humanity, and takes pride in her nature.
While ruthless throughout most of the series, she changes near the end during the Lior incident as she begins to recover some memories of her life as a human, and she softens particularly towards Scar and the Elrics. But her involvement was reckless, and allowing the Elrics' escape–a locket containing strands of hair from the woman she "was" prevented her from action–raised doubts about her loyalty. Lust was taken to Dante, who gave her a chance to redeem herself by helping Wrath take out Edward while Sloth abducted Al. Finally realizing Dante's true intentions were never to make the Homunculi human, This leads her to defecting from the Homunculi. After first trying to kill Ed, Lust betrays Wrath and forms an alliance with Edward Elric under the condition that he help make her human, In return, she would reveal to the Elrics the identity of her master. However, as she battled Wrath when he arrived to save Sloth from the ambush Edward and Lust set up for her. Using the locket and the transmutation circle that Lust made for Edward to use on Sloth, Wrath first immobilizes, then kills her by transmuting his arm temporarily into a blade (making her the second Homunculus to die). Before her death, Lust wonders: where will she go when she dies? As if the whole reason she wanted to become human so badly was so she could die and Ironically her question is answered. She is the second Homunculus to die in the anime.

Last Words: "Maybe you are right. Where did I come from and where will I go when I die? Maybe all this time that is what I wanted: the freedom to find out."