Killua Zoldyck

Killua Zoldyck is a central character in Hunter X Hunter and the heir of a famous assassin family. He leaves home to take the Hunter Exam, where he becomes Gon Freecss's closest friend.

Killua Zoldyck beyond the assassin family

Clever, playful, and fiercely loyal, Killua is also conditioned to expect betrayal and avoid stronger enemies. His friendship with Gon helps him value ordinary choice, while protecting his sister Alluka gives him a goal independent of family expectations.

Godspeed, Gon, and protecting Alluka

Killua uses assassin techniques, exceptional speed, and Transmutation Nen that converts aura into electricity, including Godspeed. Removing Illumi's control needle and leaving Gon to travel with Alluka mark major steps toward autonomy.