Name: Envy
Race: Homunculus
Age: His true age is unknown, probably at least 400 years old. He is the oldest of the Homunculi
Hair Color: Dark Green
Eye Color: Dark Violet
Height: Any height he wishes, his usual form is taller than Ed, about 5';
Skin Color: Fair
Hates: He doesn't really enjoy fighting, but he has no problem doing so. He despises the Elric family.
Likes: Killing, working alone, causing grief
Abilities: Shapeshifting. He can shapeshift into anyone in the anime, even change his voice to match the person. It is mentioned that he has incredible inhuman strength. And can at least shapeshift into one animal form.
Oruborus Location: His upper left leg.
Also note that the symbol on his headband stands for "Clay". This most likely has to do with the fact that he can change his shape, almost like clay.
Pesonality: Envy usually wears his emotions on his "sleeves". When he is angry, he lets you know it, same goes for when he's feeling spiteful or happy. He's very intelligent and knows what he wants. He follows the orders of Dante;, however, at times; he has acted on his own. Despite this, Dante is able to keep him in check by using Envy's intense hatred against him.
History:
The reason for his intense hatred of Hohenheim is because he is Envy's father (which means Edward and Alphonse are his half brothers). It is said that Envy died of Mercury poisoning prematurely. After Hohenhiem's failed attempt to bring him with human transmutation, he abandoned him. After which, Dante (his mother) took him in. About 130 to 140 years before the start of the anime, Envy helped Dante seal Greed.
Interesting Information:
To my knowledge, Mercury is said to be the element of androgyny, meaning someone could be either gender or both at the same time. It is interesting that Envy died of Mercury poisoning, and then chose to have an androgynous form. Mercury is also said to be a component in making the Philosopher's stone.