Tatarigami

Tatarigami are cataclysmic demons from Japanese mythology, though accounts vary on details most envision these creatures as immensely destructive forces of nature with malevolent intent, fallen gods of hatred and strength : they are often considered among the most dangerous of Japan's many mythological spirits.

History
Tatarigami were considered brings of massive conflicts and calamities such as famine, plague, war, death, fire and any other imaginable evil upon the lands - they could be born of fallen gods or even the spirits of particularly vengeful individuals.

Whenever a Tatarigami arose it was seen as a living disaster and only through appeasement could these monstrous spirits be prevented from tearing the world around them apart, as such many shrines and festivals arose to appease the Tatarigami and a number of these traditions lived on for a long time as part of traditional religious life.

Personalities
Tatarigami, regardless of origin, are universally hateful demons that despise the world and exist to inflict massive vengeance upon any and all in their path, they were said to often have an especially strong hatred of nobility but due to the large-scale destruction they would rain down upon the world they likely hated all life and were in essence living embodiments of pure hatred.

Despite this they could be appeased by having shrines built in their honor or having festivals, this was seen as the only sure way to stop Tatarigami.

Trivia

 * Tatarigami roughly translates into "curse spirit" or "curse god".