Tailed Beast Mode

Tailed Beast Mode is a way for a jinchūriki to transform completely into their tailed beast without dying. By either subjugating their tailed beast or learning to work in unison with it, a jinchūriki can become a full-scale replica of the beast with complete access to its natural strength and abilities. If they choose, the jinchūriki can pass control of this form to the beast itself.

Usage
Tailed Beast Mode is devastatingly powerful and poses an untold risk of collateral damage. It is for this reason that Killer B is forbidden to use the form under normal circumstances, as it could easily destroy an entire ninja village if left unchecked. The most dangerous ability available to this mode is the Tailed Beast Ball.

Variations
, and other user's of Kurama's (or Myōbu's) chakra, can use a slightly different version of Tailed Beast Mode. Though accurate in size, it is unique as they does not as closely resemble the beast as the other jinchūriki do their own.

's Tailed Beast Mode is also unique; unlike the other jinchūriki, his is composed of sand that can entirely shatter if Gaara is knocked out, and it takes quite a bit of time for Shukaku to gain its full strength in the form whenever Gaara uses the Feigning Sleep Technique. As such, it can't use the Tailed Beast Ball immediately, instead focusing on its other powers such as its sand control or its Wind Release: Drilling Air Bullet.

Trivia

 * When the God Tree's jinchūriki uses this transformation, the beast and the jinchūriki are completely separate, while the jinchūriki can still use the beast's chakra and abilities.