Gluttony

Gluttony (Japanese:グラト二ー, Guratonī) is the second homunculus to appear in the series, typically being in the company of Lust. He is a large, simple-minded homunculus whose thoughts rarely stray far from eating. He has powerful jaws, acidic saliva, and can and will eat almost anything. He particularly likes eating people, and the only way he can find enjoyment in a battle is if he believes he can eat his opponent afterwards. A running gag in the manga and anime is asking Lust (or any other Homunculi that he is partnered with) if he can eat someone. He even asks this question to the people he is fighting at that moment. He also told Wrath that he prefers girls (as in to eat, as he finds them soft and tasty). He also seems to share a bond with his partner Lust.
Gluttony is the sixth Homunculus created by Father (according to Perfect Guidebook 2 ) and the failed product of Father's attempts to create a Gate of Truth. Gluttony first appears in the series in the second chapter of the manga, being confronted by Father Cornello alongside Lust. As usual, Gluttony asks if he can eat him, Cornello now being useless to the homunculi. Lust refuses to let him, but he ignores her, possibly thinking that it made little difference. He participates in the battle with Scar, having being able to detect "an Ishbalan cloaked in the stench of blood"- another of his own unique abilities. Sadly for him, Scar escapes, so Gluttony cannot eat him. Later, Gluttony is present in Father's lair when Greed is captured, who snidely remarks to Gluttony that he has not lost any weight, though Gluttony doesn't seem to mind, and is later honoured as one of Father's loyal children.

When Envy recognised Number 66 from the penetentiary attack, he and Gluttony are sent by Lust along with Barry the Chopper's reanimated body to kill the traitor, inadvertently falling into the trap set up by Roy Mustang, and Gluttony is forced to engage in a fairly unsuccessful battle, being reprimanded by Pride towards the end, and told to leave the scene. While this is going on, Lust is killed by Mustang, something an unhappy Gluttony doesn't find out until later.
After another battle with the Elrics, Gluttony is captured by the military and taken away. Realising that Mustang is present, Gluttony seeks vengeance for Lust's death, and opens his gate, breaks free, and tries to use this form to kill Roy Mustang, Lust's killer, though he makes the mistake of eating Edward Elric, Ling Yao and Envy instead. Hoping to make it up to Father, Gluttony takes Alphonse Elric to see him, where Ed and Envy are able to escape to. In the ensuing battle Gluttony runs out of energy and he is no longer able to revive himself. Father takes what remains of his Philosopher's Stone and recharges it. He then gives birth to Gluttony by allowing him to grow off of his own body.
After returning to life, he assists in the kidnapping of Al. After doing battle with Greed/Ling Yao and Lan Fan, Gluttony becomes severly weakened once again, "dying" several times. Pride, also injured and fearing eradication, realises that Gluttony became more of a hindrance long ago, and callously eats him to gain his Philosopher's stone. Gluttony's last words were him calling out for Lust to save him, saying that it hurts. Gluttony is the second Homunculus to die permanently (after his former partner Lust), though curiously not the second, but third to be featured "flying off to heaven" in the inner spines of the tankoban volume books. The first is the original Greed, who is comically shown ascending to heaven with his deceased subordinates, even though he was just reabsorbed into Father's body as a philosopher's stone to given birth to again.

Last Words: "No... don't...eat me... Help... Lust..."