Yōkai (UFs)

Yōkai (Japanese, literally meaning Demon) and being formerly known as the Titans, were a family of Celestial Beings whom claim that the current Soul King is usurping the Soul Throne and had destroyed most of the Royal Family, the fear of the Titans (whom the older are said to be his half-siblings) caused the Usurper to throw them into Hell in hopes that he would never see them again.

In the Usurped Fury series, they are called Yōkais or Demons by Soul Society, but still called the Titans by those outside their influence.