Yugito Nii's Jinchūriki Forms

Yugito Nii is a kunoichi from Kumogakure, and the Jinchūriki of the Two-Tailed Demon Cat. She seems to be in great control of her Tailed Beast as she can induce the transformation herself.

Two-Tailed Transformation
After luring Akatsuki members Hidan and Kakuzu to a secluded area, Yugito fought the duo by tapping into the demon cat's powers.

While transformed Yugito is completly covered by the chakra of her Tailed Beast. In this form, her chakra takes the form of a Nekomata two-tailed cat, shaped by a firery blue chakra, with no pupils in her eyes.

Also Yugito has an incredible control of her Tailed Beast, being able to take its form willingly, and use its abilities, such as fire breathing. However there is speculation of to what degree of control she has, considering that because she blew up all the escape routes to capture Hidan and Kakuzu, she does not have full control of herself in this form.