He is only a tailed beast that was made up to be used in the
Naruto Shippuuden Movie 2 : Bonds.
He is non canon to the whole storyline so he is not in the manga.
Anime Movie Only...Sorry...
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Ichibi no Shukaku is gaara's tailed beast which is sealed in him
there are 9 tailed beasts (demons) . but they have been taken by the akatsuki. naruto is the nine tailed beast.
the nine tailed fox demon is the strongest now, but in manga Madara Uchiha aka Tobi says that all the tailed beasts were once the chakra of the ten tailed beast called juubi.
Because he is the the host of the one tailed beast
The last jinchuriki was Yagura who was able to have full control over the beast.