In setting: existence happens on two levels: Creation, and the Beyond. The Beyond, rarely actually referred to as that in-setting, is a big mess of Light and Dark, which are on a constant feedback loop that results in Creation. Beings from both sides come into creation and draw off of the energy of humans souls. Good things make good things happen to feed off of happiness and joy, bad things make bad things happen to feed off of fear and anguish.

I've got plenty of bad things; boogeymen are a dime a dozen in folklore, but what are some good things?
Preferably material, or "rarely seen/hard to catch," etc, you know the bit, with clear agendas and MOs.

I'd also like some neutral things. Current neutrals: Whisps and Muses; neither exclusively good or evil, though unpredictable; no more dangerous than interacting with a human (or perhaps an intoxicated human, but not that much more dangerous eitehr way).

More bad things are welcome too.

Looking for more spirits/wraiths/boogeymen/phantoms/etc, less dragons and trolls.