I'm not sure why, but Envy's my favorite of the Homunculi. The second incarnation of Greed (Ling) is a close runner-up.
And since these two go hand in hand in terms of what they stand for, I like to think they'd make for an interesting team.
Personifications of Sins are fuuuuuuun. :3
Envy, Greed, Ling, the Homunculi, and all things related to Fullmetal Alchemist and Fullmetal Alchemist: Brotherhood belong to Hiromu Arakawa / Square Enix.
Stealing them is silly. Don't be silly.