Hong Meiling is a youkai, though it isn't currently known which specific category she actually belongs to. She guards the entrance to the Scarlet Devil Mansion along with her henchmen. She is known for her mastery of the martial arts, part of which can be seen from her movement which is performed with Shin-Kyaku (a move in Chinese martial arts).

Ichirin Kumoi's personality is described as straightforward and quick-thinking, allowing her to adapt to most situations with ease.
Unzan is Ichirin's nyuudou partner. He is literally a gigantic, angry pink cloud with fists and a face, but he is described as a "gentle old man at heart."