Unsurprisingly to fans, the rarest Nen type is Specialization, which wasn't hard to figure out, even without the numbers. However, many fans probably do not realize exactly how rare it is in the HxH world. Morena reveals that only 0.033% of the population are Specialists, which makes it about 1 in every 3000 people.
Nen ( or ネン, Nen) is one of the defining features of the Hunter × Hunter series. It is a technique that allows a living being to use and manipulate their own life energy (known as aura); the term "Nen" can also be used in conversation to refer to aura.
Zetsu literally means "suppress/null," similar to its effects in the Nen power system. If Ten is the act of releasing aura, Zetsu is the complete opposite. It's the complete retention of Nen. Zetsu involves the complete closure of a Nen user's aura nodes to seal off any leaking energy from their bodies.
Shaiapouf, one of the Royal Guards in Yoshihiro Togashi's Hunter x Hunter, is a fascinatingly complex villain, particularly regarding his -coded identity. His loyalty and devotion to Meruem, the Chimera Ant King, are unwavering, bordering on obsession.
Killua Zoldyck is a trained assassin from the Zoldyck family who frequently uses Zetsu to move undetected. Killua used Zetsu multiple times to stalk his prey without alerting them to his presence. Zetsu is the cloak and dagger of the Nen system.
In (, In; "Conceal") is an advanced form of Zetsu used to render one's aura imperceptible, effectively concealing it. Unlike Zetsu, however, In does not stop the user's aura flow; instead, it hides it, making it impossible to perceive with any of the five senses or extrasensorial perception.
Zigg Zoldyck, a friend of Netero's who joined him on his expedition to the Dark Continent, is implied to be Maha's son and Zeno's father but, as he has also never appeared in the modern day of the series, this has not been confirmed. Zeno Zoldyck is the father of Silva and the grandfather of Killua and his siblings.
Illumi kills the ten dons when hired by Chrollo Lucilfer. Him and Hisoka all the hunters sent after them during the election. Is willing to let Killua him so that the act may have him “live in his heart forever."
Killua is seen inside an isolation chamber, his arms chained up. His older brother Milluki holds a whip and tortures him but to his annoyance, Killua simply sleeps him off.
Another key member of this category is Milluki Zoldyck, Killua's elder brother. Milluki is a gamer that hasn't left the Zoldyck estate since he was 10.