Baku

The is the summoned creature of Danzō Shimura. Danzō summoned it during his battle against Sasuke Uchiha.

Appearance
It is a gigantic elephantine chimera easily twice the size of Sasuke's Susanoo. It has tiger-like limbs and bandages wrapped all around its head similar to Danzō. It is predominantly dark coloured with the exception on white markings around his eyes and it's trunk. It's feet are also stripped; reminiscent of those of a tiger. He also has huge tusks and what looks like a beard.

Abilities
The Baku is said in legend to be able to devour dreams and nightmares a fact that Madara Uchiha also echoed. When it opens its mouth and inhales, it can create a powerful suction that sucks in everything within a large radius, while at the same time exhaling through it's trunk. Danzō uses this suction in conjunction with his own Wind Release techniques to amplify their power. It was strong enough to break the defenses of Sasuke's Susanoo.

Five Kage Summit Arc
Danzō attempted to use it to draw in Sasuke's Susanoo and also took advantage of the suction to increase the power of his Wind Release: Vacuum Serial Waves which together created an opening in Sasuke's Susanoo creating an opportunity for Danzō to attack. However, using the suction to his advantage Sasuke launched a fireball into its mouth, the vacuum also increased its size and power of Sasuke's technique which forced it to disappear.

Trivia

 * A is a mythological Japanese creature said to eat dreams and nightmares. As a chimera with an elephant's trunk, a rhinoceros' eyes, an ox's tail, and a tiger's paws, they resembled somewhat the real-life tapir. After the two creatures were connected, the baku was more and more often depicted as a tapir. Modern images depicting Baku as actual chimera are rare.