Lust (FMA 2003)

Lust is the first Homunculus formally introduced in the 2003 anime adaptation of Fullmetal Alchemist. (although technically not the first witnessed by the Elrics, chronologically). She is largely the same as her manga counterpart, however, she begins to crave becoming a human as the series progresses.
Her main purpose amongst the Homunculi is gathering information and traveling abroad, manipulating alchemists into creating Philosopher's Stones (her work can be seen for what it truly is in her dealings with Cornello, Mugear, Lujon, and others). Gaining true humanity is the focal point of her ambition, arguably much more so than the rest of the Homunculi.