Masamune is quite smart as he got full marks in his transfer exam and seems to also excel in sports;
When he's to please the women, he is shown to be quite flirtatious;
His training made him tough and handsome;
Be able to "read people";
His handsome features and dream-like personality makes the girls in his school swoon for him. He gets all his moves and ideas of being a 'kind boy' from romance and shoujo manga, which he had borrowed from his sister.
Although he may appear to be 'narcissistic'