SO LET US START~
"In 2003 FMA,why does Envy breakdance?"
-Envy doesn't actually "breakdance" his fighting skills are actually based off of Caperio,the Brazillian method of fighting,it's actually a combonation of dancing with martiel arts.It's believed it was an acient form of fighting within the actual FMA universe that was abandoned in the East.So as a picked up skill from living as long as he has (400 years in the first anime) it was used by Envy.It's a very skilled,and very hard art of fighting to master,and with his super human agility and speed,it fits him.
"What is Envy's GENDER/SEX?!"
-Envy actually has no gender(in both really) he was born/created as a shape shifter.Which means he can be either whenever she wishes.But asw a head cannon theroy many fans believe,the androgynous form he's in (as his main form) is believed to be a "hermaphrodite" a person who's actually inbetween sexes,as a birth defect,meaning they possess a form of both male and female hormones and mixed in genitals (both),but it's believed in Alchemy,that a hermaphrodite IS the perfect being.So with his "homunculi are perfect" complex,he chose such a form to fit both his shape shifting,AND the belief that homunculi are in fact,the perfect beings in existence.
"Why doesn't Envy like humans?"
-Envy has a major complex of not feeling accepted or boasted enough thinking if he doesn't reassure himself,he's actually below others.So he feels the need to be sadistic,which is his nature to humans,to have the habit or killing them off one by one to help him truly believe homunculi are superior,when seeing humans can be so happy,while homunculi (in 2003) are abandoned and cast aside as nothing,incomplete,soulless creatures noone could love,while humans are happy with their families (while in the Manga/Brotherhood) he has such a dysfunctional family,he craves what he sees within human society,where all he wants is to actual endure the simple confilcts and problems of humans,instead of being used as a tool from father,while his nature and being as a homunculus,restrains him to such a fate.
"Can envy love someone?"
-Well it's a very complicated thing,but Envy IS capable of love to a certain point.But in a relationship,he would be VERY cruel and sadistic within it,which needs extreme paitence,but with his cruel nature,due to his desire of just wanting to be loved,he would also have a gentle,caring and protective side.BUT with that,he would be EXTREMELY protetive and obsessed to having that lover to himself.He can easily split sides and always be paranoid of the lover's actions and thoughts,always needing reasurance,but along with such a thing,the relationship would be very dysfunctional to most people.He isnt the type to change his personality and nature,even for love.So he would need a person just as cruel,broken and obsessive as he is.In a since,compatible with him.
"Why does he wear a skirt?"
-IT'S A SKORT,And to fit along with his androgynous form,to emphasize his inbetween appearance.
"WHAT'S WID DA HAIR?!"
-Well the actual..style,I'm unsure,but for the color (2003) is to emphasize "Green with Envy" since the color is pure Green.Brotherhood failed to rip off the same idea.