Greed

Greed (Japanese:グリード, Gurīdo) is a greedy Homunculus, called the "Ultimate Shield" because he can rearrange the carbon in his body to make his skin as hard as diamond, thus making himself almost impossible to injure. As his name implies, he is a very avaricious character, who likes living in luxury, surrounded by powerful minions and beautiful women. He also has a habit of flipping people off in the manga. Despite his generally greedy nature, he is shown to honestly care for his subordinates, as detailed below.
Greed, the third Homunculus created by Father (according to Perfect Guide Book 2), apparently abandoned the other Homunculi over 100 years before the start of the series and claims to be around two centuries old. He first appears hiding in the Devil's Nest in Dublith, with his gang of chimeras all of whom he apparently rescued from military experimentation. After learning of the Elric brothers' battle with Scar, he becomes intrigued with the notion that the youngest brother, Alphonse, is an independent soul bound into a suit of armor. Contrary to fact, he believes that existing in this state would make him truly immortal. He sends out his gang's smallest member, the lizard chimera Bido, to confirm his suspicions. Bido locates the brothers, but is discovered and barely escapes the two.
His hopes confirmed, Greed orders the rest of his gang Roa, Dolcetto and Martel to capture Alphonse. After a long chase the chimeras capture and bring Al to Greed where he introduces himself and starts questioning Al about his empty armour. After a short conversation, Al synthesizes stone fists to crush Greed. To his shock, Greed shrugs the hit off. He then orders Roa to smash his head to pieces with his hammer. In seconds, Greed rises up with no wounds, explaining that he is, in fact, Homunculus. Some moments later, Izumi Curtis storms in to rescue Alphonse. She quickly gets in a fight and finds herself outmatched by his Ultimate shield. After she is beaten, Alphonse agrees to make a deal with Greed, to stay with him willingly in exchange for information on Soul Attachment. Greed agrees and Izumi leaves Devil's Nest to tell Ed about the deal. Suddenly, Führer King Bradley arrives with Alex Louis Armstrong and an army unit to reclaim Al and eliminate the chimera's.
Izumi attacking Greed.

Shortly after, Edward rushes into the Devil's Nest to rescue his brother and confront Greed. Finding him, Ed pays no attention to Al and Greed's suggestions about a deal and demands Greed to free Al, saying he wants nothing to do with his plans. Dolcetto tries to physically force Ed to agree but gets beaten in seconds. Seeing what Ed is capable of, Greed fights Edward alone. After getting his neck broken, Greed changes to his completely armored form.

Now practically invulnerable to physical harm, Greed seems to gain the upper hand in the fight. Ed, however, manages to figure the alchemic process behind the Shield (rearranging carbon molecules into a diamond-like form) and nullifies it with his own alchemy. Before the two can finish their battle though, Bradley's army unit storms the Devil's Nest. Greed manages to escape, with Alphonse still in his custody. However, in the sewers below the club, he is met by King Bradley. Not knowing the Fuhrer's real identity, Greed orders his gang to dispose of him. In a matter of seconds, Bradley kills all of Greed's gang (except for Bido), before revealing himself as a Homunculus. After repeatedly killing Greed until his Philosophers Stone is almost depleted, Bradley impales Greed with four swords and takes him prisoner.

Shortly after that Greed is brought before Father and the other Homonculi and recognizes them all, save Bradley who then introduces himself as Wrath. After gleefully insulting Envy, Greed flippantly refuses to rejoin Father's scheme. Knowing he is but an obstacle in his current state, Father lowers Greed into a vat filled with a boiling liquid, and melts him down into his consistuent Philosopher's Stone. Greed remains defiant to the end, laughing maniacally and screaming curses at everyone present.

In Chapter 54, Greed returns to the story as Father exudes his son's Philosopher's Stone core and inserts it directly into the body of Ling Yao to create a second Human-based Homunculus and fill the empty space left by the first Greed's defection and Lust's death. Inside the Xingese Prince's body, Greed speaks with Ling, who accepts the Homunculus' power of his own free will, but not before expressing surprise at realizing that the prince's greed could parallel his own. This second Greed maintains all the same personality and powers as the first (his Ouroboros tattoo is even in the same spot), but appears to have none of the memories, not recognizing Envy, Gluttony or the Elric Brothers. As such, he becomes a faithful servant of his Father as the first Greed was presumed to have been initially and refers to all actions prior to his rebirth as having been done by "the other Greed". But as a result of being accepted willingly into a body with such a strong will, it seems that both the consciousness of Greed and Ling exist in the same body, with Ling being able to take control for short periods of time as made apparent when Edward wakes up Ling's consciousness by mentioning Lan Fan and when Ling tells Wrath to shut up for insulting humans. It would appear that when the right eye is covered by Ling's hair, Greed is in control and when the left eye is covered, Ling is in control. Though Greed respects Ling for having the avarice to accept his power and the will to take over his body, he is very annoyed by the fact that Edward keeps calling him "Ling".
The second Greed.

Greed's new position seems to involve standing guard over Father's lair and dealing with intruders, as witnessed in Chapter 73 when he is spotted merely watching Father sleep and, more poignantly, in Chapter 82 when he chases Bido (who has blundered into the Homunculi's inner sanctum) with the intent of killing him. Because the new Greed shares powers and mannerisms with the first, Bido recognizes him despite his different body. Greed is confused by how much this odd stranger knows about him, but shrugs it off and uses Bido's relaxed guard as an opening to kill him, stating that the lizardman has the wrong Greed. But as soon as Bido dies, Greed begins to have mental flashes back to his first life and his comrades at Devil's Nest and begins trembling uncontrollably. Ling berates the Homunculus from inside for killing a comrade and believing that the old Greed's memories and feelings could be purified. He informs Greed that things that have become part of a soul can never be truly washed clean or forgotten. Holding Bido's body in his arms, Greed has a complete mental breakdown and then rushes to the Führer's mansion to confront Wrath. The two Homunculi do battle as Greed demands to know what is going on, but when Greed notices that Pride is there as well, he flees, defecting from Father for a second time.

In his state, Ling takes the body over again and wanders to Mustang's safehouse outside Central City, encountering Edward, Heinkel and Darius. As Ling threatens to divulge parts of Father's plan to them, Greed takes over once again. Edward offers to allow Greed to join the good guys, after learning that he has left the Homunculi forever, but Greed says that his greed can not be satisfied by working for Edward or merely being the Emperor of Xing, as he desires the whole world. The only way he'll help is if Edward offers to work for him instead, which the Fullmetal Alchemist accepts. For the next few months, Edward, Heinkel and Darius work as Greed's outlaw henchmen, using the basement of the Rockbell house in Resembool as their hideout before returning to Central for the final battle. They are confronted by Pride and Gluttony, against whom Greed must allow Ling to fight with the body under his control because he can sense the Homunculi's aura, but after Gluttony is killed and Pride is trapped, Greed takes his chance to escape from the battlefield. Realizing that the only Homunculus left to guard Father is Sloth, he heads to Central Command to take a stand against his creator.

In Chapter 97, Greed reappears to confront the returned Wrath at the entryway to Central Command and engages him in combat, claiming that his avarice now desires Wrath's life. With Ling providing tactics from inside Greed's mind, he manages to hold his own against Bradley in hand to hand combat, deflecting sword strikes with his armored hands and moving into the Fuhrer's blind spot, until Wrath removes his eyepatch and gains the upper hand. Though Briggs soldiers attempt to come to Greed's aid by providing cover fire, Greed warns them to stay uninvolved in the fray. His advice proves justified when Wrath mercilessly cuts down all who fired impotently on him. After Captain Buccaneer manages to disarm Bradley, Greed engages him again, only to be met with further resistance as Wrath procures twin bowie knives with which to do combat. Fu arrives on the scene to provide further backup and the two prepare to take on Bradley in tandem. Wrath still holds ground against them both and eventually wounds Fu fatally. Fu tries a suicide bomb attack against Bradley, but fails with Bradley slicing through the detonators and Fu himself. Cpt. Buccaneer stabs one of Wrath's swords through Fu's body, wounding Wrath. Greed continues the fight, hitting Wrath to head with his hardened arm and seemingly blinding his Ultimate Eye. The Gate is opened on Central, distracting Greed, which gives Bradley time for counterattack. Wrath throws them off the walkway but Greed manages to grab the side of walkway. Lan Fan and Briggs men try to help Greed up but he and Wrath weigh too much. One of Briggs soldiers shoots Wrath down to moat surrounding Central HQ. Greed, reverting to Ling Yao, promises to Buccaneer to guard the HQ's gates. He then transforms to his fully armored form and charges against the attacking Central forces, although not before offering "those who have a family, a lover, or simply doesn't want to get hurt" and women to leave (only to be ignored). Central troops are quickly defeated before Greed's might.

A short while later, as Father is prepared to use the five sacrifices to open "The World's Gate", Greed suddenly appears right behind him and cuts him down while saying the world belongs to him. But his attack fails to kill Father as the latter tells him that he knew Greed would come as he was born from his own avarice. When Father successively bring God down to earth and make him a part of himself, Greed, Mei, Roy, Izumi, Lan Fan, Scar, Hohenheim, Alphonse, and Edward are the only ones left free while everyone in the country's souls are removed and contained within Father's new body, much to their shock. When Scar activates the redesigned country-wide transmutation circle and restores alchemy, Greed aids the brothers in battle with Father until his stone is depleted sufficently that he flees to the surface. Without alchemy to aid his assent, Greed climbs up himself and finds Lan Fan standing beside the fallen body of Wrath, Greed is quietly angry with Wrath for dying with a smile on his face.

Finally reaching the surface, Greed finds all the allies desperately fighting to bring down fathers strength. As he watches Father fight, Greed envys Father's powers and claims them for himself, saying that the power of God will finally sate his desires. Ling disagrees but Greed orders him to be silent and charges headlong into battle. Since Father's power is waning and he is losing control over the God that he has absorbed, Father decides to lower his guard in order for Greed to strike him and in doing so reabsorb his son's Philosopher's stone. However, Greed anticipated the move and Ed siezes the opportunity to strike Father directly. Though the attack fails Fathe'rs overuse on his power causes him to lose control of God and his body begins desintegrating. When Edward regains his right arm and tries to finish Father off, everyone cheers for him except Greed. Quietly the homunculus admits to Ling that the true thing his has always wanted was not world domination, but to have friends like them.

In the end, Father attempts to absorb Greed's Philosopher's Stone. As Ling attempts to hold on to Greed, Greed tricks him into letting go, making sure that only he was absorbed. He then proceeds to reveal a variation of his powers. After being absorbed by Father, he begans to transmute his body into the weakest form of charcoal, thanks to his powers over carbonization. Father, angered that Greed would rebel even in the end, kills him. His last moments are reflecting that neither Ed nor Ling showed him the respect he 'deserved,' but accepted it in the end and says farewell. Greed is the sixth Homunculus to die (permanently).

Last Words: "Ahh... it's enough. I don't need anything else. Gahaha... see ya. Friends... of my soul."