Board Thread:Theories and Speculation/@comment-30168130-20161223235115/@comment-734582-20161226121602

Elveonora wrote: So it is possible to temporarily obtain Kekkei Genkai powers from chakra alone in special circumstances like the Sharingan. I diagree, but mostly because of terminology. Compared to ordinary chakra as we see it, these special chakras are so different in nature it's IMHO not worth calling them chakra.

It seems the true nature of chakra is that it's power of the afterlife. Regular chakra is but a pale imitation. Compared to these however, the soul also seems to be a form of chakra, yet somehow it's a different chakra from a mere chakra imprint. It's weird, but that's because Kishimoto never was very precise with wording.

The Biju were made from the Soul of the juubi, and given some substance. They're thus creatures made entirely of chakra, but of "spirit chakra" and "physical chakra". "Spirit chakra" is what powers Edo Tensei (Edo's are in fact comparable to Jinchuriki). "Physical chakra" we've already seen e.g. with chakra threads and chakra clothes.

So while Biju are made of chakra, it's nothing like the regular chakra people spam.

Secondly, by being Spirits, the Biju can lend their power and KKG to their hosts, just like Edo Tensei. But this is not a feature of ET or Biju but a fundamental power; Hagoromo as a spirit could grant his powers to Sasuke and Naruto and Obito did it with Kakashi