What I've been so curious about her is that she is very curious about that she didn't know or that she didn't remember and that she had experienced it. She is kind of defensive towards the people that she didn't know, like from the first chapter of how she met the Brotherhood. She can be acting like a little kid with her expressions. Nayarii has changed a lot ever since she's been left alone twice and learned of defense. She can also be strange, too.
That's what all I know about Nayarii, along with her character and personality so far.
But I believe that I guess that we'll have to find out more about Nayarii, her character and personality further on.
But deep down, Nayarii is on the quest about herself and what's she's been missing that she really needed.
That's what I think.