Anita

Anita is an anime-only character in Nippon Animation's version of Hunter × Hunter.

Background
She is the daughter of a wealthy spice merchant who was assassinated by one of the Zoldycks. Anita takes the Hunter Exam because she knows that Killua is there and she wants to kill him to avenge her father.

Hunter Exam arc (anime-only)
Anita, examinee #111, fails the second phase in the 287th Hunter Exam. She then goes as a stowaway on Chairman Netero's airship, carrying the candidates to the third phase. There she meets Killua and attempts to attack him with a knife. But Netero intervenes, knowing that she failed the exam, and keeps her under watch until they arrive at the next phase.

Anita breaks free and goes after Killua again; this time, Killua is in his assassin mode. He changes his hand into the claw and slices the blade off her knife. He then pins her to the ground and holds the claw to her neck-ready to slice her throat. He snaps out of assassin mode just before he is about to do this and knocks her out cold instead.

When the airship reaches the third phase, Anita is sent back and Killua tells her that her father was really a drug merchant. The spice in his mine was a highly addictive substance; her father made profit on the suffering of others and that was why he assassinated him. Anita takes this very hard she always thought of her father as a kind and loving man and she begins to cry.

Trivia

 * In the 1999 anime, 41 people pass the second phase of the exam and Anita sneaks into the blimp and therefore they become 42, but she was captured later while another examiner was injured by killua, therefore 40 applicants remain. In the manga, 42 people pass the second phase and Killua just kills 2 applicants.
 * Killua claims that either his mother or one of his siblings killed Anita's father.