This is one made up by a patron!
Otoshishi are wild beastmen. They listen to no rules and like to stuff their faces whenever possible. While they will chase down humans when especially horny, it is easy to distract them or earn their trust with food.
It's easy to know when they are nearby, not only because they tend to be loud, but because of their strong boar-like smell. While the smell is strong and gamy, it is also somehow pleasant to humans.
Otoshishi all wear boar masks, only revealing their true handsome face to the human who earns their love. They most commonly have blue ombre hair and green eyes, but there is a rare variant with green ombre hair and blue eyes.
They are very overprotective of their mate.