He is the canon character for me.
He is so caring and supportive towards MC in others' route as well...
Lol, I was actually thinking of him when the line popped up...
He provides support to all characters in need. In every character's route, the segment Through Kasumi's Eyes is really something to look forward to. Even if he suffers internally, he still supports everyone with his full heart. I think that's what makes him different from others.
Ahh, I also went through some chapters of other characters, and I really felt that MC in each one has a total flip through. In Takado's, I read somewhere that the personality of her was not that appealing. In Hosho's story, she is a little bit more clingy. Because she confessed to him way faster than expected. I guess that went along with the theme of his story.
In Sen's route, she is a litlle more friendly? Caring? (Their banters were also much lesser).
In Kasumi's route, she is more mature and character development is visible.
What do you think? I personally preferred Kasumi's MC.