Very passive, he never chooses anything he wants to do, he just does what others tell him to do, how many things did he do because he really wanted to? Marin's dress and save Kaori?
As I said before. Yuuya's mentality of not wanting to stand out is stupid. He's the type of emo MC who has no ambition, it's so boring, even so far Grayfia hasn't been eaten by him.