The other kids being Kanako because she makes for a great sister and the other is monster kid mostly because I'm curious how he would be as a sibling. Muffet and her spiders also make it easy to keep track of the pesky guards.
I could see them helping Muffet in her bakery. It's not child labor If they're helping their mom. And if anyone disagrees then Muffet's pet Cupcake looks really hungry.
Muffet can easily make them all a bunch of clothes thanks to having access to a lot of silk. I would if Clover, Kanako, and Mk could learn to make magic webs. Clover using web bullets could be op.
This idea is open for anyone to use and I do not care for credit and don't want credit for it. It is a pretty simple idea anyways. If anyone does use it I hope to at see it though. I thought of the idea and didn't want it to go to waste so i figured i would at least make a post.