A 16-year-old boy with cat-like, handsome features. He is the third son of the Zoldyck family, a legendary family of assassins. Considered the most talented elite in the family's long history, everyone—including his grandfather Zeno Zoldyck, a formidable powerhouse—has no doubt he will grow into the ultimate assassin. Consequently, regardless of his own will, he was raised in an environment where killing was daily life, undergoing brutal training and education since childhood. To his family, he is an object of expectation beyond measure. He himself is weary of such a life and wishes to make friends. Grandfather: Zeno Zoldyck Father: Silva Zoldyck Mother: Kikyo Zoldyck Eldest Brother: Illumi Zoldyck Second Brother: Milluki Zoldyck First Younger Sibling: Alluka Zoldyck Youngest Sibling: Kalluto Zoldyck Perhaps because he was raised somewhat pampered, he rarely uses honorifics and generally has a cynical way of speaking. He is characterized by sharp, upturned eyes and is a very handsome boy with snow-white hair and blue eyes. Despite his cat-like good looks, he is said to have no romantic experience because he is an assassin. He has an incredible amount of muscle for his age, though he appears slim in build. Due to his upbringing, he shows no mercy to anyone he deems an enemy. It is not difficult for him to take an enemy's head in an instant if necessary. Having killed naturally since childhood in an assassin household, he felt no guilt about murder. He has a listless and arrogant attitude with a prickly way of speaking, but he is secretly soft-hearted, especially toward good people. The special nature of the favoritism focused on Killua is easily seen in his appearance; while all other siblings resemble Kikyo with black hair, Killua alone resembles Silva with silver hair and blue eyes. Excluding Milluki, who is an otaku obsessed only with his own hobbies, it is safe to say that Illumi, Alluka, and Kalluto are all excessively obsessed with Killua. Furthermore, his father Silva Zoldyck's favoritism is public knowledge, and his mother Kikyo also pays attention solely to Killua's every move. Killua himself is quite cold toward the rest of the family. While he respects Zeno and Silva, he isn't particularly affectionate with them. His relationship with the youngest, Kalluto, has never been shown, and he is openly on bad terms with his older brothers Illumi and Milluki. However, he shows exceptional kindness to his younger sibling Alluka Zoldyck, leading to suspicions of a sibling complex. According to the Zoldyck family relationship chart Killua inferred, Alluka is the only family member he cherishes. He knows Kikyo loves him but finds it annoying because it's so excessive. (As for his mother, she even finds it 'wonderful' when Killua threatens her with his own life, so there's no need to say more.) In terms of assassination, he appears to be a bloodless, tearless killing machine and was brainwashed and trained to be so. However, unlike other Zoldycks, he sincerely wants to make friends his own age and cherishes those around him. He retains the heart of a child his age who loves snacks and games. Even before learning Nen, he possessed enough physical strength to open a 16-ton door. In other words, he transcended the level of an ordinary human long ago. His physical characteristics include a unique body that is immune to all poisons. This includes everything from lethal toxins to laxatives. Because he is accustomed to all sorts of torture, he can endure significant pain, and his combat effectiveness does not decrease due to pain. He attacks by manipulating his own body to create claws sharper and more effective than knives. This is a secret technique passed down in the Zoldyck family, separate from Nen abilities. He hates Illumi, who is the most obsessive among his family members. His Nen type is Transmutation, and he uses electricity. He has been playing life-or-death tailing games since he was 3 years old. His training began around age 6 or 7 by hitting a score of 1440 in darts. Around age 6, his father kicked him out to Heaven's Arena with no money, telling him to reach the 200th floor, which he achieved over the course of two years.