Manaphy is a small, blue, aquatic Pokémon with stubby feet and club-like arms that are longer than its body. It has a red gem on its chest and a yellow dot below the gem. Its onion-shaped head has a pair of long blue antennae, which have small spheres on the ends. Its irises are dark blue with yellow sclerae, and there are two yellow dots of "eyelash" markings extending from the eyes.

Eighty percent of Manaphy's body is made of water. It is highly susceptible to its environment and swims long distances to return to its birthplace. Manaphy prefers to live deep underwater, on the cold seafloor. It has been known to visit the coastal waters of Hisui, occasionally with Phione following it. It is born with a special power that allows it to bond with any Pokémon. One epithet for Manaphy is "Prince of the Sea". As as depicted in Ranger and the Temple of the Sea, Manaphy is capable of learning and speaking the human language. Manaphy is capable of breeding Phione; despite their resemblance and familial links, the connection between the two is unknown at this point.

(Source: Bulbapedia)