Relgaia

I knew the years I wasted on researching every bit of lore I could find for an RP guild in Mabinogi when I was younger would pay off!

So, the main points brought up in this thread:

Would Milletians be Sterile?
Most likely no. The reasoning behind this is that every Milletian is given a healthy body so they can fight. Remember, Milletians weren't brought here to just enjoy life and have fun. They were brought in to help fight against Fomors and save the world for the goddess. I doubt she would decide to snip them randomly- because as shown in later Generations, they were brought in with the capacity to overwhelm gods innately in them and this flips out the gods so much they think they should get rid of all of them.

What happens to a Milletian's old body after rebirth?
Y...y'all realize that the bodies return to the Soul Stream right? You have to go into the Soul Stream to Rebirth. Furthermore, it's heavily implied Milletian bodies are similar to the Added Soul Phenomenon seen in G1. They're spirits made flesh. Furthermore, Rebirth isn't jut "dumping" your old body. It's most likely the spirit changing the body- something that can only happen in the Soul Stream due to the Added Soul Phenomenon that occurs there. And lets say it was just dumping your old body and moving to a next, it would probably remain in the Soul Stream and return to whatever magical energy it took to make it in the first place- since remember Milletians aren't born. They're spirits from other worlds given flesh by Nao and the Goddess' magic.

Could a Milletian get prego with other races?
Honestly, probably. Let's be real, they're made of magic and have the ability to change their appearances. Even though we can't switch between races, there are NPC milletians who have- Shakespeare in example. However, the child would most likely be of one race or the other with small features of another. Uh as for those with Giant fathers.... well, chihuahuas have mated with larger dogs before and they were fine. Milletians are probably stronger than chihuahuas.

What happens to a pregnancy during rebirth!?
One of two things, either it terminates because #newbodnewme or because rebirthing is hinted to be the soul remaking itself, it's possible the fetus would remain as the Milletian would just form the new body around the baby. As for gender swapping, it would most likely just terminate the pregnancy because there would be nowhere for it to actually be.

WHAT ABOUT LITTLE ORPHAN ALYN!?
Honestly, she was probably brought into the Soul Stream at a very young age and was adopted by native parents who couldn't handle raising a Milletian. Furthermore, we've never really seen parents just "abandon" their child- not really. Any story orphans are generally orphans due to something like the Tragedy of Emain Macha- aka their parents were killed. And it is stated in the event that she abandoned by choice, not by tragic death. This implies it's not really something that happens often unless there are drastic reasons. Furthermore, the fact that you, the literal super savior of the world was asked for advice regarding this issue kind of further points to the fact that natives of Erinn don't really deal with this normally.

This implies that either A) Her adoptive parents were natives who couldn't handle a milletian child suddenly growing to fast or Her adoptive parents were milletians who just didn't want to deal with the kid after taking her in

What would a Milletian's child even be?
Tuatha de Danann. A native because their soul is from this world- not another like a milletian's. They would age like any other native NPC. Which would be pretty heckin' tragic.

What would happen to the kid?
Honestly, probably a confusing childhood while constantly forgetting their milletian parent(s). Imagine growing up and your parent constantly changed age and could be younger than you after a certain point. Furthermore, because milletian's perceive time so much faster than natives... uh 52 years for the milletian parent would pass and it'd only be one year for the child. Remember 1 week is 1 year for a milletian while time passes as it does IRL for the natives. So from birth to the age of 18... it would seem like around 1,000 years to a milletian. Finally, it'd be tragic as hell because natives just can't remember milletians due to how fast they move through time and the nature of their souls. It's a phenomenon that's noticed and even studied in the game lore. This is why NPCs constantly forget us and we have to give them more gifts.


So... in conclusion?

Yeah... a milletian could probably have a kid but it'd flippin' suck.