Mahōshi

Móyù (魔域 (モユ), Moyu; Chinese for "Demon") are s, similar in nature to s, that have completely fallen into spiritual depravity. They reside within Hell, and are commonly found around The River of Styx. They are bound to Hell, like, by chains crafted from their own sins. Known as Demons (デモンズ, Demonzu), by, they are commonly envisioned as monstrous beasts. However, they can shape-shift. So, whilst Humans classify them via their beast-like appearance, they can walk around with the appearance of an average Human. Some believe, due to the presence of religion, that they all derive from the Fallen Angel,.

History
During ancient times, when religion was at its high point, Humans believed in the presence of evil spirits.

Behind the Scenes

 * The creation of Móyù, according to the Author, is a means to expand the world of Bleach. It, similar to a variety of articles upon the Fanon, introduces something not yet mentioned within the original story. It also, albeit rather loosely, further opens up possibilities for the Fanon by introducing a unique twist on a commonly brought up race.