Glad you liked the concept and characters! In order to have them make more of themselves, they need 3 clay, and you need to craft a sculpting stand. If you don't have that, their behavior should default back to "None". Unfortunately, there's a bug in the game where if their goal is set to none they will not seek out their needs and will just die, sorry. As for making them stick to it, you can't unless you have a steady supply of clay. I should have definitely not made it that way, though. I only coded it that way because it was easiest. Thanks for playing!