Bijuu: Gobi
Animal: Okami (Wolf)
Benefits:
Bijuu form one: defensive and offensive chakra
Form two: Chakra that acts as a stronger shield and looks like fur. Jinchuuriki will now be able to use chakra attacks.
Form three: Bones that add to defense. Becomes overall more powerful.
Form four: Bones mainly increase defense, strength, and speed of host. Extending chakra arms have greater strength. Host can now use condensed chakra blast.
Form five: Ultimate defensive chakra of the Gobi jinchuuriki forms. Host becomes overall more powerful.
Full demon: Host takes form of Gobi and can decimate area over long distance with condensed chakra blast.
Bijuu forms:
One tail: chakra cloak.
Two tails: Chakra turns into fur
Three tails: Skeleton forms
Four tails: Skeleton takes up fixed position and increases host's strength, defense, and speed greatly.
Five tails: Second layer of chakra forms around skeleton and the host.
Full demon: What do you think?
Demon info:
The only bijuu that sometimes fights other bijuu for humans. Has many attacks using chakra.