Yes, the skin color and ears can be made in CAS, but that is not what I am talking about, these are aliens, they have their own genetic skin color, abilities.
In CAS I can make a sim purple and give them pointed ears, fangs, bald, and many other things; but the alien powers, the alien eyes, that can't be made in CAS. At least not to my knowledge. Only aliens have the power bar, the ability to consume space rocks, probe and give/drain from a sim. How long are those abilities passed on? Has anyone continued past the third generation? So far, with mine, the third generation may have those abilities, my sim hasn't gown to child yet. I am going to go and play that game now; I have a feeling that I will have to advance that child to YA quickly to check that out.
Edited
I was too impatient to wait and see if anyone has raised a sim alien child to more than one generation. So, I aged my sims to get the answers.
First generation is Astra whose father is human and other parent is alien.
I was unable to hear her voice as a baby, toddler and child. When she turned teen I could hear her voice and the brain power bar showed up. There was no energy bar, and she had the ability to drain or give energy, probe and repair objects. She could consume rocks and restore energy. She needed very little sleep so it is definitely a good thing for jobs that require long hours of work.
Second generation, she and hubby Taber had two children, boy and girl (Megena). Both were unable to be heard as babies, toddler and child. When they turned teen I could hear their voices. Like their mother, they had the green skin, large black eyes and pointed ears; although it was a bit lighter in the shade of green. At teen they were as their mother, consume rock and rest.
Third generation, Megana and her hubby had a baby. lighter green skin, large eyes and pointed ears. With Star I was able to hear her voice as a baby, I could just hear it, but it was there. As toddler, I could still hear her voice and at child the same, light but it was there. I aged her up quickly from toddler to teen to see if she had the abilities of her parent. None, she has the light green skin, but just a hint of green, large eyes and pointed ears, no eyebrows, but does have hair, but I had given hair to Astra when she was born and her hubby (human) had hair so that is probably the reason. Aged her up to teen, she has all the same bars as a full human teen does, none of the abilities of an alien.
My plans are to take the male alien child of another sim family, age him up and then move him to that town and get him and Star married to see how many generations are added by adding his bloodline. I think I will also move him to the town so I can see if he is married to Megana, and I know that Star will then have some alien abilities, but will her offspring? That I want to find out.
As a note, I think the voice problem, not being able to hear them is due to my sound card, it is not a high quality and so I think affected the ability for it to be created.