Showing great promise from birth, Killua has already mastered many killing techniques at a tender age, and is set to be one of the best assassins the family has ever produced.

Much of their relationship was inspired by the protagonist's personality and young age, while Killua was influenced by several works Togashi enjoyed reading and watching.

In the anime adaptations of the manga, Killua has been voiced by Kanako Mitsuhashi and Mariya Ise in Japanese and Annika Odegard and Cristina Vee in English dubs.

[2] When deciding on his appearance, Togashi refer to his mental inventory of manga, novels, movies, music, historical and cultural figures, entertainers, and athletes that he had seen.

In the case of Killua, around the time that I was deciding what number child of the assassin family he would be, thoughts of Kuroyume's shounen, Atsushi Kamijō, Multiple Personality Detective Psycho, among others, came to mind, and these led to his appearance.

In the full-body illustration when he first appeared, there's a part where the outline is interrupted by light, and the artist made see references to Kamijō and Shou Tajima.

[3] Ise's performance met positive response by Togashi himself in his twitter account based on how carefully she portrayed Killua's sensitive side much to her own surprise.

[4] Cristina Vee said that while Killua comes across as happy child, he has a notable dark side as a result of the family who raised him.

47, 48, 137] He becomes one of the first people to beat Greed Island, helps stop the Chimera Ants, and uses his sibling Alluka's special abilities to heal the dying Gon.

60, 122] His Hatsu involves various uses of electricity to increase his physical capabilities, such as Godspeed (神速, Kanmuru), which allows him to move at immeasurable speeds.[ch.

[16] Jujutsu Kaisen manga author Gege Akutami was also influenced by Killua's character when he saw the deteriorated state Gon was brought down after using his entire health to defeat the Chimera Pitou.

This resulted in a similar scene from Jujutsu Kaisen where the protagonist Yuji Itadori stares at his friend Megumi Fushiguro in horror when he becomes the new vessel of the villain Ryomen Sukuna.

[20] Website Polygon listed Killua as one of their "favorite boys" in on how determined is to help Gon across the series as a result of their friendship, to the point he comes across as the more likable character from the duo.

[22] The same website said that while there are several moments Killua stands out thanks to his developed characterization such as his bonding with Alluka or Gon, there are also counterpoints where the dark influences the Zoldyck upbringing he had resulted in his character acting in a more negative manner.