Wing

Wing is Zushi's teacher, and the man who introduced Nen to Killua Zoldyck and Gon Freecss. He is an assistant master of Shingen-ryu kungfu, a former student of Biscuit Krueger, and a skilled user of Nen.

Personality
He is somewhat absent-minded about his appearance and has a fairly modest demeanor. However, he is more than he appears.

Wing's personality takes from his youth when he trained under Biscuit. She described him as a guy who "always falls asleep and wears his clothes inside-out no matter how much you warn him." She also states that he was "really bad at learning", and was surprised that he became a teacher.

Heavens Arena arc
Gon and Killua first encounter Wing and his student Zushi when they are competing in the Heavens Arena. Having deceived the pair about Nen prior, Wing begrudgingly takes on Gon and Killua as students after the two reach the 200th floor such as to protect their lives from those who use Nen. Wing gently jolts open Gon's and Killua's aura nodes and trains them seriously for several months in the Heavens Arena. He punishes Gon for playing around during his match and restricting him from seeing Hisoka's match and using Nen for two months. After the pair finishes learning the basics, he congratulates them as they pass the secret part of the Hunter's Exam, revealing he is their Examiner and that most of the other Hunter Examinees that passed are learning Nen as well.

Greed Island arc
His next appearance is during the Yorknew City arc when Gon calls him for advice in developing a Hatsu ability. Wing and Zushi were still at Heavens Arena at the time. He was also mentioned by Biscuit Krueger to have been one of her former students.

13th Hunter Chairman Election arc
Wing makes an appearance at Isaac Netero's funeral and at the election for the new Chairman. He is last seen checking up on Gon at the hospital.

Nen Ability
Wing is an Enhancer and his abilities are yet to be revealed. Based on his knowledge and his ability to be able to do most of the nen priniciples wih ease it is likely that he is almost on par with his teacher, Biscuit Krueger.

Trivia
Chairman Netero and is the head master of Shingen-ryu.
 * It is known that in Hunter x Hunter (2011), his teacher have been changed to