The Candy Witch is probably the witch from Hansel and Gretel, the Sea Witch from the Little Mermaid, the Snow Witch from the Snow Queen, the Witch of the West from the Wizard of Oz, and the Briar Witch from Sleeping Beauty.
I’m gonna take a guess that the Mirror Witch is based on the evil queen from Snow White, but I have no idea from what fairy tale the Witch of the Moon could have been inspired by. Anyone have any ideas? The mention of how she led a group of soldiers makes me think that maybe it’s the Red Queen from Alice in Wonderland, since she’s the only one I can think of who’s got an army. Maybe the moon imagery is because of the relation to rabbits and lunacy, and Wonderland tends to get related to delirium and madness.