Sloth - 2003 anime

Sloth (Japanese:スロウス, Surōsu) was a Homunculus initially created by Edward Elric and his brother Alphonse in an attempt to transmute their deceased mother Trisha back to life. She is a character exclusive to the 2003 anime series, named after Sloth, a vastly different character from the manga.
The organic mass that was formed from the failed event was fed Red Stones by Dante, thus giving Sloth the appearance of the late Trisha. Sloth's unique ability as a Homunculus is to alter her body into pure water, which she uses as a means of transportation, espionage, and also killing by drowning her victims. She is also seemingly able to convert her full length purple dress into water, but no other clothing, as her secretary's uniform tears when she encounters the Elrics underground.
Sloth's final appearance in the anime is during a battle with the Elrics at an abandoned warehouse, after she, along with Lust and Wrath, is sent to capture them. Encountering Shou Tucker, Sloth coldly informs him that she no longer wishes to allow him to continue with his experiments, having witnessed the "useless chimera doll" that Tucker created. She almost succeeds in her task, having charmed Alphonse into taking her side. However, she is severely weakened by a lock of Trisha Elric's hair (the remains of the human on whom she is based) and is ultimately betrayed by Lust, who attacks her to prevent her from reforming her liquid body. Lust has already been through similar emotions that Sloth goes through, and recognizes that Sloth must die, as she stands in the way of the Elrics making her human. Sloth escapes Lust when Wrath shows up to attack the latter, and Sloth hides in Alphonse's armour and controls his movements, intending to return him to Dante. Edward confronts her, and she takes time to explain to him why she must kill both he and his brother before going on to inform him that she should hate him anyway for ever creating her. She admits that Lust was being truthful where her memories were concerned, and it is left ambiguous as to whether Sloth ever truly believed Dante's lies. In any case, at this point she has the Elrics completely at her mercy, but unfortunately Wrath, having killed Lust and absorbed Trisha's remains moments earlier, embraces Sloth and the remains cause her to become immobile. It is then that Sloth recognizes the moment of her defeat. Edward uses alchemy to transform her body into ethanol, and she slowly evaporates into the atmosphere. She had been lying about her feelings all along, and she took the opportunity to admit so as she died. She was the Third Homunculus to die. Sloth later appears as a cameo in the penultimate episode of the series as another form Envy takes to torment Edward in battle.

Last words: "Nicely done, sweetheart. Clean up after yourselves and take care of each other."