But ain't that the idea? Each of them barely gets individual time, (outside of H-Scenes) and when they did, they seemed interesting, like that scene where Ami and Yamato were hanging up clothes. Well, not Tatsuko so much, but I like that kind of cute sleepy character too, if they focused more on her life outside of fawning over Yamato, there could be actual investment there.
Plus, I really like the way the Itagakis act as foils to the Kazama family.