huge spoilers from the first FMA series ahead so if you havent watched it don't read them...
Seems like in eitehr anime Envy has a good few compexes...in the first version he definatly had certain abandonment issues. I suppose all of these thingsgo to set him appart form the other humunculi who mostly act based on furthering the overall plan so as to reach their goals while Envy is motivated to kill and do harm to humans by his own anger for them. In the first version of the anime the other Homonculu were angry at the humans who made them and abandoned them but that anger was probably somewhat tempered by the fact that they knew those humans had thought their transmutation a failure. Envy was even created by his father and I believe Hoenhiem(sp?) was aware of what Envy was when he abandoned him. Wrath had similar issues as he was created by his actual mother..but seemed to be willing to somewhat forgive when offered the sort of attention he desired. I suppose Envy had given up on humans entirely whereas Wrath was still trying to sort his feelings out.   See 30 other replies