Kalluto has a shoulder-length black

Kalluto has a shoulder-length black hair and pink eyes. There is also a noticeable mole near the side of his mouth. Kalluto's most commonly seen attire is kimono. When he was first introduced, he wears a long black kimono, a yellow obi tied around his waist, and a pair of Japanese sandals named Zōri . During the Chimera Ant arc Kalluto's kimono is black with violet and white edges.
Personality
Kalluto has a silent and obedient personality, often seen doing what he is told. During the first part of the series, Kalluto doesn't mention more than six words. Later on Kalluto appears to be a more talkative and confident, as seen when he thought he could rise to be number to 2 in no time. Kalluto also seems to be quite calm person. Although later, it is shown in his fight against a Chimera Ant that despite his calm demeanor, Kalluto is shown to have a brutal side and also a bad habit of playing with his victims.[1]

He also has a habit of questioning his abilities, if he is not good enough. He also says that he is used to enduring the pain. Kalluto possess an inner determination, as seen when he swears to get his brother back showing that he does care for Killua in some way, even when realizing his massive inferiority to other Phantom Troupe members.[2]

He also seems to be quite loyal to his comrades as he offered to help Feitan in his fight against Zazan, but was rejected. While he has a very good relationship with his mother, he is said to be envious of his older brother Alluka,[3] for some reason that has yet to be revealed.

Plot
Zoldyck Family arc
Kalluto watches
Kalluto watches behind the bushes
Kalluto first appears spying on Gon in the bushes, as the latter attempts to pass Canary's guard.[4] Kalluto silently watches as Kikyo tries to convince Killua that his friends will never open the Testing Gate. Before Kalluto and Kikyo leave Gon and his friends, Kalluto asked Gon who he is, and he replies that he is Killua's friend. Kalluto gave him a curious look then ran after his mother.[5] Kalluto is seen after that with his mother, witnessing her trying to stop Killua from leaving home. He stands quietly while Killua leaves, looking only once back at Killua with surprised look.
Yorknew City arc
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Kalluto appearance in Yorknew City arc
Kalluto appears again in the Yorknew City arc, in which he and his great-great grandfather Maha assist his big brother Illumi in the assassination of the Ten Mafia Dons who have placed large bounties on the Phantom Troupe's heads.[6] He later acts as a decoy to help Illumi switch places with Hisoka in the Troupe's hideout[7]— Hisoka has hired Illumi to disguise as himself so that he will be able to leave without being noticed and fight Chrollo.[8]

Greed Island arc
Kalluto GI
Kalluto in Greed Island
During the time the Phantom Troupe is on Greed Island in search of an exorcist, Kalluto is introduced again,[9] this time as Hisoka's replacement, and it is his abilities that helped them successfully find the Exorcist, Abengane. Even though he has a perfect Zetsu, his presence is still detected by Hisoka, who goes on to praise him for having a lot of potential.

Chimera Ant arc
The Phantom Troupe arrive at Meteor City
The Phantom troupe arrive at Meteor City
Kalluto accompanies Shalnark, Feitan, Bonolenov, Shizuku and Phinks back to the Spiders' hometown where they see mutated Chimera Ants and learn that a self-proclaimed "Queen" turns humans into Ants.[10]

During the Phantom Troupe's assault on Zazan's palace in Meteor City, Kalluto grows excited when he hears whoever defeats the queen will become the de factor leader. He is shown to be spying on other members of Phantom Troupe by using piece of papers. When he realizes that Feitan had found the Queen he wonders how should he kill the Queen before Feitan, but is distracted by Chimera Ant, who calls him a girl and asks him to come over. Kalluto refuses and says he is in a hurry, preparing to fight against the Ant.[11] Kalluto fights a Chimera Ant, which he kills after torturing it for a while.[12] He is seen after killing the Chimera Ant, thinking that he should break his habit of playing with his targets before leaving to a place where Feitan is.[13]

Kalluto prepares to kill the ants
Kalluto prepares to take out the remaining Ants
Kalluto watches Feitan fight against Zazan, impressed by Feitan's speed and getting irritated when others comment that Feitan is still rusty and not moving well.[14] It is then revealed that he joined the Spiders with the intention of bringing back an older brother of his. He anticipated that he would rise to the number 2 position in the Troupe very quickly, but is left in awe of the Phantom Troupe's combat proficiency and has to admit to himself that his own skills are still too lacking compared to theirs to achieve that objective. However, he swears to keep enduring until he can bring his brother back. Kalluto offers to help Feitan at one point, but is declined. When Feitan is about to use his Nen powers, Kalluto is eager to see Feitan's power.

Kalluto then helps his comrades to kill the rest of the mutated Chimera Ants. He is lastly seen witnessing Phinks throwing rocks at Shalnark and Feitan.[15]

13th Hunter Chairman Election arc
Although Kalluto doesn't formally appear in this arc, he was shown in a short flashback of Killua when he was younger. Kalluto, along with his older brothers Milluki and Alluka, are out for a walk when they met a photographer. Milluki tricked the photographer Muuna into saying 'No' to Alluka's wishes 3 times.[16] Later, it was also stated that Kalluto is envious of his older brother Alluka.[17]

Abilities & Powers
As a Zoldyck child who often participates in his family's assassination missions, Kalluto probably possesses high resistance to poisons and electricity, great agility and physical strength, and advanced assassination techniques. Kalluto is shown to have an extreme speed, being able to run trough the Zoldyck Estate in few minutes. He can manipulate his paper confetti with accuracy through swift movements of his fan.