This has been bugging me for a while but why are the 'things' that are created from human transmutation (Which has been stated is impossible) so randomly generated.
Ed and Al set out to transmute their dead mother but turns out to create some weird thing which was later identified to be some random male with black hair.
If anything why doesn't the end result of the transmutation be something more similar to what they initially wanted to revive? Why male not female? Why black hair not brown hair?
Additionally, what are they actually, other than failed outcomes of human transmutation?