OKAY SO LET ME TELL YOU ABOUT THESE TWO. Of all the things in Minecraft "lore" that no one talks about it's the blue and green text from the end credits. (If you don't get what I'm talking about, here's a link http://minecraft.gamepedia.com/End_Poem )

They basically tell you that they are everything, including you. I decided to give them some sort of form, even though in (minecraft) reality, they don't have one...yet they have all forms.

It's also said in the poem that the player is reading their thoughts, so it implies that they don't have mouths to speak with, so words travel telepathically (or...become projected on a screen? I dunno)

I've decided to give them long hair, but note that this does not determine their sex or gender =P I'm sure that they or agender, or genderfluid. One of those.