The five weird ghosts. Between the five of them there's only one eye, which the ghosts share. They come upon sleeping people, lick them and sniff them, causing disease. But they can't sniff and lick you if you're a good person -- or an evil one. They only afflict those who are neither good nor evil. Artwork by Shigeru Mizuki.
Māo guǐ (猫鬼), aka cat ghost. Illustration by Shigeru Mizuki. It's said that practitioners of bad magic will send a cat's ghost to afflict people. Some of them will even kill cats in order to command their ghosts. Those afflicted by cat ghosts will feel as if their body and skin is in stinging pain -- the cat ghost is devouring their internal organs. That person will start vomiting blood and die soon after.