[Guess whose
beautiful son has joined her in the mansion, in Realdoll form? If Realdoll made little kids, that is. Kayako knows it's not really him, but this seems like a great opportunity.
So she's sent him out to troll the mansion. Feel free to come upon him lurking in stairways or corners. He'll likely follow you around, under Kayako's mostly inaudible directions. Just be careful not to break him, or that pesky powder will get on you.
Not that Kayako would let anyone who hurt her precious son toy survive long enough to transform, anyway. She'll be watching him closely, and never be far away from him. Which means she'll never be too far from whoever he's bothering, either.]