Kalluto Zoldyck

Kalluto Zoldyck  is the younger brother of Killua and is the youngest child of the Zoldyck siblings.

Personality
Kalluto has a silent and obedient personality, often seen following what he's told.. It was later revealed that he can be a bit of a sadist after his battle with a chimera ant and tells that he is used to enduring.

Appearance
It is a common misconception that Kalluto is female. Though he wears kimonos (a woman's dress), the manga explicitly states that the Zaoldyeck family has five sons. Also, in the English dub, Kikyo introduced Kalluto to Gon and his friends as a young lad. Further more, the official HxH guide book states that Kalluto is male.

Zoldyck Estate
Kalluto is first shown after Gon was chased by the Mike the Zoldyck family guard pet, but he was initially introduced accompanying his mother during Gon's retrieval of Killua from Kukuroo Mountain.

Yorkshin
Kalluto appears again during the Phantom Troupe arc, Where Maha and Kalluto assisted Illumi with the assassination of the ten mafia dons that had placed bounty on the Phantom Troupe's heads. He also used himself as a decoy to help Illumi switch places with Hisoka (who hired Illumi so that he could do battle with Chrollo) in the Spiders' hideout

Greed Island
After the Phantom Troupe's entrance into Greed Island in search for a nen remover, Kalluto was introduced as Hisoka's replacement and it was his abilities that led them into finding the nen remover.

Chimera Ant Arc
During the Phantom Troupe's assault on Zazan's palace in Meteor City, he reveals he joined the Spiders with the intention of finding his missing older brother Alluka. He was left in awe in the phantom troupe's combat proficiency and admits his skills are still lacking compared to them.

Nen/Ability:
Kalluto has the ability to manipulate paper, using a paper fan and confetti as a weapon.

Surveillance Paper Dolls

By creating a paper doll of a person and attaching a small piece of paper to that person's body, Kalluto can hear anything being said within the vicinity of that person.

Paper Fan blade

by using Shu, Kalluto can use a paper fan as a cutting intrument capable of cutting steel.

Dancing Serpent's Bite

Kalluto also uses Confetti as a weapon. By fanning them at the enemy, he can locate weak points depending on where the confetti sticks. Kalluto then sends a concentrated stream of confetti snaking through the air, cutting or piercing that location on his opponent.