Nekomata
This is an old bakeneko with a tail that has split in two (distinguishable from having two tails, since they join before they reach the body). The literal translation of Neko-mata is "Forked cat". Again, these cats have become quite big – some are said to be about one and a half meters long (not including tail) – and walk upon their back legs.
Cats are often associated with death in Japanese, and this particular spirit may be to blame. Far darker and malevolent than most Bakeneko, the Nekomata is said to have powers of necromancy, and upon raising the dead, will control them with ritual-like dances - gesturing with paw and tail.
The older, and the more badly treated a cat has been before its transformation, the more power the Nekomata is said to have. To gain revenge against those who have wronged it, the spirit may haunt humans with visitations from their dead relatives.
Like bakeneko, some tales state how Nekomata have taken on human appearance – but have usually appeared as older women, behaving badly in public, and bringing gloom and malevolence wherever they travelled.
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Thank you C. an C. for granting my tail wish come true.