Supmop: it's the way she talks. I guess you need to know Japanese to understand it (and I really don't mean this in a cocky way!), but she gives off this really cute and affable performance in pretty much all of her work. The problem is it's almost too perfect like she was an android programmed to emulate a cute human AV star to the best extent possible. I only mean this for her roles where she simply plays "herself". Drama roles with learned dialog are a different story altogether.
I don't really understand whats you mean, I can't speak japanese, but I think I can guess whats you mean