Sasuke is a doll. When the various people from Kyo's past and Mibu characters show up is when SDK starts to get good. A lot of people think it gets good when Yukimura shows up, but while I like him now (though I find him the least interesting of the main cast) my reaction to him was "Oh no, not one of these!"

Sasuke definitely follows the type. Sasuke is kind of determined to be stoic but it doesn't really work because everyone but Kyo and Yuya tries to shake him out of it and squeeze the stuffing out of him. He likes Kyo because Kyo ignores the fact that Sasuke is half his size and takes him seriously, and he likes Yuya because she also takes him seriously and commendably resists her visible urge to squeeze the stuffing out of him. It is entirely possible she is just the first almost-normal woman he's ever met.

I admit, though, that I wouldn't really consider it reading without Yuya and Kyo/Yuya.