Neferpitou has the appearance of a humanoid cat with wavy white hair. Its cat-like ears and tail are covered with yellow and white fur, respectively. It has ruby-red eyes, and its knees have demarcated joints like insect legs. Its hands are slightly bigger than a normal hand for their size. Its clothes are a blue overcoat with six yellow buttons and cufflinks, shorts and orange socks with thin black stripes, and a pair of blue shoes.
Neferpitou is very loyal to the King, just like the rest of the Royal Guards and would sacrifice themselves for him. Neferpitou gets distracted easily, loves to play a lot and that makes it the most curious of the three Royal Guards. Hence its cat-like appearance, Pitou is a cat Chimera Ant who loves to play with its opponents like a cat would with its prey. Despite its cheerful and playful manner, Pitou has been shown to have a sadistic and terrifying personality as well.
Neferpitou is the first of the three Royal Guards born for the Chimera Ant King. Pitou is also personally named by the Queen, as are the rest of the Royal Guards. Pitou, similarly to the other Royal Guards, has no memories of its previous life.
Neferpitou first appears when Rammot and Peggy look for the missing rare prey, Pokkle, in the Chimera Ant nest in NGL. Rammot, having acquired Nen after being attacked with it, suddenly feels Neferpitou's frightening aura. Pitou enters the room and smells life hidden under a pile of bones, discovering Pokkle. Pokkle is manipulated by Neferpitou and teaches the Chimera Ants about Nen and water divination; afterwards, he is brutally killed and fed to the Queen.
Neferpitou discovers that it is a Specialist and exits the nest to find out the extent of its new found powers. Meanwhile, Kite, Killua, and Gon have made their way to the Chimera Ant nest and plan on killing the Queen before she gives birth to the King. Kite feels a powerful En. Kite then understands the depths of the dark aura coming from Neferpitou. He tells Gon and Killua to run, but Neferpitou has already located the trio and slashes off Kite's arm in an instant. Gon quickly unleashes his aura after seeing Kite's arm ripped off, but Killua knocks him unconscious and runs away with him. Neferpitou battles and kills Kite, having enjoyed the match, decides to re-animate Kite's dead body as one of its puppets so they can enjoy another fight and the other Chimera Ants have something to try with.
The Queen is mutilated during the birth of the King, who then leaves with all three Royal Guards. Some of the remaining Chimera Ants flee NGL and start their own independent lives. Neferpitou assists the King in overthrowing the government of the Republic of East Gorteau. Under the guise of the former king of the Republic, Ming Jol-ik, the Chimera Ant King initiates the process of forcibly awakening Nen in the civilians of East Gorteau in order to form his own personal army to conquer the world—resulting in the deaths of millions unable to awaken Nen. As Ants formerly under the Queen's rule rejoin the King, the Hunters Association mobilizes quickly to stop the oncoming genocide by sending in an Extermination Team of Hunters to East Gorteau.
Residing in the East Gorteau palace, Neferpitou uses its Nen ability to manipulate hundreds of soldiers in the capital city of Peijin to rally citizens together. Their plans are thwarted by Killua, Knov, and Morel. As the day of the selection finally occurs, the Extermination Team attacks the palace and causes massive damage. The King's consort, Komugi, is mortally wounded and under the King's orders, Neferpitou heals her. Gon, however, threatens to kill Komugi unless Neferpitou agrees to restore Kite following the woman's treatment. Though a promise was made to go with Gon to Peijin to restore Kite, once they've reached the area, Neferpitou affirms that it is impossible and subsequently prepares to kill Gon. Gon then forcibly ages his body through sacrificing nearly all of his aura and kills Neferpitou in battle.
However, Neferpitou's loyalty and devotion to the King was so great that even after its death, Neferpitou's nen still remained; its Terpsichora, even stronger than before, manipulated the corpse and attacked Gon. Gon, believing that Neferpitou is dead, is attacked by Neferpitou's corpse and loses an arm. Gon then pins Neferpitou to the ground with the arm he lost, and uses one final attack against Neferpitou, apparently destroying Neferpitou's body. However, its corpse is later shown abandoned in the woods, probably with Terpsichora dispelled.