Yua is a young woman with a massively optimistic and somewhat ignorant perspective.  She intends to leave a positive impression on other people, also impulsively believing that she’s responsible for putting aside everything to make that positive impact.
Growing up, she’s also been subject to vivid lucid dreams, having a fixation with them growing up.  All the way to wanting to seek a method to experience another person’s dreams

PERSONALITY

Yua is ultimately a peacemaker type, and would instead try to keep herself well balanced on the fence, although it varies on the situation.  It isn't uncommon for her to agree to something with the intention of sucking up to another or avoiding trouble.  However, she does try to raise fair arguments for and against the different points she'd be subjected to.  There is so much that she'd be willing to put up with for the sake of keeping moods and morale balanced. 

 
After the first reset, Yua develops a more sceptic mindset and is more willing to defend what she believes in.  While she is willing to argue against friends with opposing ideas and opinions, she does have her boundaries.  
If anything, she's still reluctant to cause trouble, especially with those she cares for dearly.  Although, she does make an effort to try and blur the lines a little by easing into sticking back to the fence again.