People keep wondering what light world object that Ralsei is, being carried around by the main duo, to become real in the dark world.
But no one seems to consider that he could be what is within the school closet, where the chalk originally was supposed to be.
Maybe there's a lost and found, or some kindergartner dropped a toy in class and it's there until it was to be picked up again.

Our fluffy boy's body is still in the school supply closet. Which means when that fountain the the closet is finally sealed, he ceases to exist.