I think this is the biggest weakness of this manga. The author tends to get into these loops where they repeat the exact same plot, or even the same set of panels, three times, over and over, with very little variation, and it just feels kinda dull. The sisters are distinct in the sense that they look different, have different skills and slightly different personalities, but they end up doing almost the exact same thing as the others in pretty much every chapter (or set of three chapters). It's almost like they're a single character.
No, he just has the face of a world class actress that worked in basically every role, so when he shows emotions strongly they really show. His superpower is "my mom was hot and so am i"