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 legendary beast that eats dreams and nightmare, and was much bigger than he expected. Danzō took advantage of the suction to increase his Wind Release: Vacuum Serial Waves. However, the suction makes it weak against fire-based techniques, as Sasuke Uchiha took advantage and launched a Fire Release: Great Fireball Technique into its mouth, causing it to disappear.

Abilities
Even though that its not really seen much of an action, it has an ability to blow strong winds from its trunk that helps Danzo in his Wind Release Techniques.

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.