Tailed Beasts

The Tailed Beasts are nine giant monsters that serve to drive the plot of the Naruto series. They are differentiated by the number of tails they have, ranging from one to nine. The tailed beasts are large, living forms of chakra, sometimes referred to as "Chakra Monsters", giving them power that far outmatches most shinobi. However, this immense strength is tempered by their bestial nature, which restricts them from being intelligent enough to use it effectively. As such, when the tailed beasts are sealed within humans, they are able to benefit from the knowledge of their hosts, giving them the ability to better utilise their powers. Tailed beast chakra is coloured red.

Due to their strength, the beasts are usually treated as mere tools to be used or taken, a sentiment they detest; although they have knowledge of the Sage of the Six Paths and seem to be aware of their origin as pieces of the Ten-Tails, they view themselves as individuals with their own personalities and emotions, and a good portion of their rage stems from being treated as mere "pets" of the shinobi.

However, their relationships with each other are little better. Although they are able to communicate telepathically with each other and their jinchūriki, and know each other on a personal level, there is a significant amount of conflict between them. One reason is due to Kurama's belief that their strength is determined by their number of tails.