Baku

The was a personal summon of Danzō. It is a gigantic elephantine chimera with tiger-like limbs and bandages wrapped all around its head, and has a powerful suction from its mouth. According to Madara Uchiha, it is a tapir that eats dreams and nightmares, and was much bigger than he expected. Danzō summoned it to battle against Sasuke Uchiha, but it was forced to disappear when Sasuke launched a fireball into its mouth.

Abilities
The Baku is said in legend to be able to devour dreams and nightmares. When it opens its mouth, it can create a powerful suction that sucks in everything within a fairly large radius. Danzō took advantage of the suction to increase his multiple vacuum blades. However, the suction makes it weak against fire-based techniques, as Sasuke took advantage of, and launched a fireball into its mouth, of which increased in power when it went into the Baku's mouth.

Trivia

 * A is also 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.