Killua Zoldyck

Killua Zoldyck (キルア・ゾルディック, Kirua Zorudikku?) is the co-protagonist and best friend of Gon Freecss. He is the third of five children of the Zoldyck family.

Killua has spiky, white hair and blue eyes. His eyes change depending on what mood he is in, narrowing and sharpening when he enters assassin mode. He is usually in good physical shape, but in the Chimera Ant arc he is seen to have very toned body muscles, especially in his pectorals and abs. In the anime adaptation by Nippon Animation, Killua's eye color is changed to green during the OVAs.

Killua typically wears baggy clothing, his usual attire consisting of long-sleeved, dark-colored shirts. Most of his shirts have turtlenecks. Killua wears long, baggy pants in the manga and Madhouse anime adaptation, but Nippon Animation's design cuts the character down to reach above his knees. Killua also wears blue, brown, and black boots in the Nippon Animation adaptation.

Killua is initially presented as a character who seems similar to Gon, cheerful, daring, and full of mischievous ideas, although deep down they turn out to be total opposites, being the contradiction to what each one appears to be; so he is truly a kind, caring and sensitive boy, a way in which he does not like to show himself very much. He is also one of the fastest-thinking characters in the series. He is confident in his own abilities, often being humble about it. But when someone compliments him, especially Gon, he gets embarrassed easily. Killua is also known to have a passion for sweets, as he spent almost 200 million Jenny on sweets when he was in the Sky Coliseum. His favorite food is chocolate, specifically chocolate robots.

However, his cruelty and aptitude in killing show another side of him: deadly, violent and bloodthirsty; a side shaped by his treatment and training since childhood. Having been tortured since birth, Killua has been conditioned to possess extreme tolerance for poison, electricity and pain. He possesses extraordinary agility and strength that make Killua a killing machine making him definitely not someone to be trifled with.

Killua was born as the third son of a family of well-known assassins, the Zoldyck Family. Showing great promise from birth, Killua has managed to master many killing techniques from a young age, and is set to become one of the greatest assassins the family has ever produced. At the age of three, he began his training in tracking other people. He was forced to fight in the Heaven's Arena martial arts tournament at the age of 6, in which it took him two years to reach the 199th floor (although he has been accepted into the 200th floor, he dropped out). Killua divulges that since birth, he has been constantly training for the occupation of a professional assassin. Killua had spent years trying to hone the unique skills that assassins portray and possess.

Bored and tired of killing, Killua unexpectedly rebelled against his family, injuring his mother and second brother, and ran away from home to take the Hunter Exam for fun.

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