I'd certainly love to have Masaki explore the second and third floor! Because she's still getting to know the place and she hasn't really gotten a chance to during the day.

I would be interested in having Rei speak to Tanny in the cottage if she's still there. As for everything else-I'm not sure what else she's up to, considering that she's still recovering from giving birth. Might be interested in having her trying to do something with the wisps of darkness, or the monastery if she has time.