What's a good iOS game that lets you customize characters and create your own scenes?

Okay, so my niece is all about this Gacha Nox thing. Apparently, it lets you really go to town customizing characters – clothes, hair, eyes, the whole shebang. And then, she spends hours creating these little scenes with them. Honestly, it's a bit beyond me, but she's happy and it keeps her occupied. From what I gather, there's no end to the combinations you can come up with. If you've got kids or grandkids who are into character design and storytelling, this might be right up their alley. It's free to play, so you're not risking anything to give it a shot. Just keep an eye on those in-app purchases; those can add up quick if you're not careful. For a free game, it seems to offer a decent amount of creative control, so I guess it's worth a look if that's your thing.