Ancient Japanese Masks

These masks are called "Noh masks," and they are used in Noh theater, a unique type of Japanese theater.

The red mask with two horns on top is called "Bonjour" and is used to show the image of an angry, resentful woman, so it's scary to see a woman angry. ...... It's also seen in anime. As for the ninja wearing this mask, no other meaning, is to cover the face to hide the real identity only.

The mask with the white hair should be the one the old man carries.

The ghost with the long neck could be a flying head barbarian. Legend has it that the long-necked demons all take on the image of a woman with an elongated neck, so that they can roam around at night without restraint, and they can also go to the residence of a male they like, get into his bedroom and watch him sleep. There are also two types of long-necked demons, those who can follow their own thoughts and fly freely, and those who can't control where they go and float around unconsciously. The long-necked demon that can travel with its own thoughts is said to suck the blood of people and kill them

As for the last one, it's unclear because the description isn't very clear. Personally, I think it's Aju. For more information, please visit "Japanese Legend Aju" on Baidu.