The Octopus is a species of marine mollusk that has eight legs and no shell. Octopi can move about the ocean floor by using their many legs, or they can swim by using a unique jet propulsion system created by using their siphon. Octopi can shoot blobs of ink at a predator to more easily get away from predators or rivals. Octopi are also the smartest of all invertebrates, and can solve puzzles made for human toddlers and preschoolers.
There is a tribe of octopus located near the coast of the Fire Country that is extremely intelligent, to the point of being able to speak human language. Their leader is Takodaifu, a friendly rival of Gamabunta. Hikari Hyuga had signed a summoning contract with Takodaifu and was able to summon octopi in addition to slugs.