Baku

The is the former personal summon of Danzō Shimura.

Appearance
It is a gigantic elephantine chimera, large enough to dwarf Sasuke Uchiha's Susanoo. It is predominantly dark-orange in colour with the exception of its trunk, legs and the markings around its eyes. Its feet are striped — reminiscent of those of a tiger and it also has huge tusks, what looks like a beard, as well as long, sharp claws. It has bandages wrapped around its head and plated armour at the base of its trunk.

Abilities
The Baku is said in legend to be able to devour dreams and nightmares, a fact that Tobi 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 its trunk. Danzō uses this suction in conjunction with his own Wind Release techniques to amplify their power. It was strong enough to break the defences of Sasuke's Susanoo.

Five Kage Summit
During his battle with Sasuke at the Samurai Bridge, Danzō summoned the Baku and attempted to use its powerful suction ability to draw in Sasuke's Susanoo. He also took advantage of the beast's power to increase the power of his Wind Release: Vacuum Serial Waves technique, which was able to carve out an opening in Sasuke's Susanoo, thus allowing Danzō to attack Sasuke head on. Using the suction to his advantage, however, Sasuke launched a fireball into the Baku's mouth, increasing the fire's size and power, forcing it to retreat.

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.