I don't mind Yuna's behavior. In fact I also like tough woman. But I do hope when we get close to her and make her gf/lover/partner she will be less of a bitch knowing that mc is a capable, genuine good guy.
Well, I think it's trust issues.
Yuna can't be vulnerable until she knows, that MC is gonna stick around.
No matter what!
So there is also abandonment issues that makes her cold and detached.
And the issue of loss is a substantial factor in her actions and behaviour
towards others.
And she is reading people pretty much off the bat.
High perception skill
That's why MC thought she read his mind.
It's skill that I think she honed during a long time to assess threats
and opportunities, thats what keept her alive.
So if you're not friendly the feeling of pain to loose someone don't affect
you as much. As being engaged and involved. A lot less to lose, a simpler
way to protect yourself from pain and harm. Kinda important if you are
emotional broken since childhood.
But she might open up if the MC makes her feel safe,
and she might be more open and kinder.
But she is protecting herself and others.
Who knows, I mean with enough trust she might be a real sweet heart.
But I think you really have to earn that trust, so she can relax,
then she might feel no need to be bossy, in private or in any other
settings when she can trust that she is with friends.
But at the moment she regards every new thing or person as
a threat to the ones she protecting.
So her guard will probably be up for a long while.
Only the writer knows her and how this character will evolve.
That's how I see it.
Well, I guess you basicly said the same, with a lot less words.