Worldbuilding - What are the universal rules of Kingdom Hearts?

NOTICE: This episode used to be called "WorId Order," but a certain video streaming platform thought we had different intentions with that title. In all of Kingdom Hearts, it's only ever said once: WorId Order. For a phrase rarely mentioned in the dialogue, it's actually one of the most important building blocks to the whole series itself, taking Sora through the delicate balance of exploring and safeguarding the realm. Next week's episode: Pureblood and Emblem Heartless. Send your question...