Ayra can marry any of the 13 male characters that isn't named Sigurd or Quan. However, she does not even have one chat with anybody that isn't named Lex, Chulainn(Holyn) or Arden and the only times she ever speaks with them are:
-When Ayra, Lex and/or Chulainn don't have any lovers during Chapter 3, one of them can talk to her to give her a Brave Sword and both that male and Ayra get 100 lover points for each other.
-When Ayra has Lex, Chulainn or Arden as a lover in Chapter 5, she can speak to them, but nothing happens. Nothing is gained, lost, just a normal chat.
That's literally the only time she will talk to any potential lovers. For the ones who can support her that isn't named Lex, Chulainn or Arden, they won't even speak with her once, not even before that moment happens. I even double-checked everywhere to even make sure and I have not found one chat between Ayra and another character that isn't named Lex, Holyn or Arden. Heck, what makes this strange is that some of the fathers can actually talk to their children, but never once to their lover. Like if you have Finn pair-up with Ayra, he can speak with their daughter, but he never once speaks with Ayra.
We can agree that in Awakening and Fates that some of the characters have marriage supports that are out-of-place or have silly reasons, but at least they actually talk and learn about the other and at least even have reasons before marrying in the first place. In Genealogy, you can have characters marry each other and they won't even speak to each other once. And the game can even make the player lose out on things if the player wants to do a particular pairing.