Envy is the embodiment of some of Father's envy. Envy is genderless, and it has the ability of shape-shifting and this ability can be used to assume the form of any existing person (or original personas that Envy itself creates). It can even modify its own voice to directly copy others.

Envy, who exists only to make humans suffer, bears more bitter resentment for humans than any other homunculus, and negatively treats with humans in the most personal and heartfelt manner. Its hatred for humans has an immense emotional and personal foundation greater than any of its siblings'. It is most comfortable in the form of an androgynous teenager (which it thinks is "beautiful" and "adorable"). Envy can easily be set off by insults to its large and delicate ego, thus causing it to make mistakes.Envy is one of the two Homunculi who possess "true forms"-physical incarnations of their traits and personality that take shape when their stones are almost completely depleted. The other homunculus with a true form is Pride.