I think someday Synthetic Biology will make possible to create artifitial humans made of flesh and blood ( Iam not talking about robots and androids made of inorganic matter). Do you remember the replicants from Blade Runner?
Since they will be bioengineered they would surely have features that "normal" humans dont have or it os quite rare to have. For exemple a synthetic person could have new and unusual eye colors like mauve and magenta. They could have plant genes added into their genomes in order for them to have colorful skin and hair like green, blue or true red.
I believe that they could also have animal features like wings and tails but I am not sure if they could fly like a bird if they had wings.
They could also have unusual physical features for their biological gender. For exemple a synthetic male could have very large breasts much like Bob in the movie Fight club or a synthetic female could have a dense and long beard like ancient paintings.
In Blade Runner the replicants look indistinguishable from naturally born people. Do you think that in the future synthetic humans will look like any other person or will they be truly bioengineered mutants given the fact that genetic engineering will be advanced enought to allow them to exist?