These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
The Chimera Ant arc ran for more than 7 years, thanks to it having long breaks on top of lasting 132 chapters. This arc has been much better received in the 2011 anime due to the long breaks not existing...but even then, the arc took over a year to get through at 61 episodes!
The Hunter Exam in the original anime where portions of the arc was extended with Filler.
Angst? What Angst?: Gon. His father abandoned him to be a Hunter, never once contacting him or checking in on him afterwards. His response? Try to become a Hunter to find out just how great it is that you would be willing to abandon your only son. He also isn't upset about most things. The first anime subverts this by giving posttraumatic reactions after receiving pity from Hisoka in the exam.
Finally subverted in the Chimera Ant arc, where he goes through a severe Break the Cutie situation when his mentor is killed by an Ax-Crazy cat ant. He becomes infuriated with the latter's sudden show of empathy to an insult to his simple world view, and the Awful Truth that his mentor who's long been dead finally drives him down the Despair Event Horizon/
Asspull: Gon's overpowered adult form might come across as this considering how out of nowhere Gon reaches the King's power.
The Ghost of Nen. It only appears right after the death of Pakunoda and by that time there have been already lots of deaths in the series including another Spider.
The Tower of Heaven arc usually gets this for wasted potential beyond being just a training arc for Gon and Killua to learn the basics of nen. Throughout the arc, there is legitimate build-up to fighting possible "tower-heads" if one was to rise high enough in the tower...and yet Gon and Killua never get a shot to fight at least one of these leaders and basically called it quits after Gon's fight with Hisoka.
The Genei Ryodan arc was noted by many to have one of the most disappointing endings in the series due to almost all fights being cut short and others shoved offscreen and some wonder if the author actually plans to make it continue in some time.
Depending on who you ask, Mereum. Most tend to argue that there was hardly a reason to bring him back after his battle against Netero if he was just going to slowly die off to the poison of Netero's rose-bomb.
Gon vs Pitou. There was a lot of build up to this fight. However, the end result was a one-sided massacre in a few minutes rather than the long drawn-out epic duel a lot of people were expecting to see.
Are disappointed or don't mind that it's a reboot.
Are disappointed that the new series doesn't change things aroundnote Including things like anime-only characterizations, such as Killua's moodiness like the previous one did or don't mind that it's truer to the manga.
Lately each major arc seems to do this. Greed Island got really long winded and overly complex, but had some redeeming qualities shine through; and opinions are REALLY divided on the Chimera Ant arc. Some declare it the complete and utter ruination of the series, while others find it to have the depth and complexity that makes Hunter x Hunter stand out among Shonen.
The opening theme from the reboot has been used for all episodes regardless of the arc. You either love it or hate it. The former also started growing tired of it.
The narration throughout the palace invasion portion of the Chimera Ant arc gets this in both the manga, and the 2011 anime adaptation. You either enjoy it, because it brings a different approach to portraying how the battles go down, or you find it annoying, and just wish it did the battles in normal Shonen fashion.
Cult Classic: The original anime and manga had such a strong following that it got a revamp by MADHOUSE in 2011.
Designated Hero: Lampshaded a lot. While in the Chimera arc, the King will allow several humans to survive, the Hunter Association wish the Chimera's complete extermination. It goes so far that even Gon could be a Designated Hero. His desire for revenge goes so far that he threatens the Chimera with killing the innocent Komugi.
Die for Our Ship / The Scrappy: While most of the characters are likable, fans genuinely agree that Pouf is an incarnate of the Ron the Death Eater trope, as he tried to have Komugi, the one who was causing Meryem to act kinder, killed and his Large Ham obsession with the king that go on for pages are very long winded, long story short: he is the least liked of the Royal Guards.
Ensemble Darkhorse: While initial opinions about Pariston were mixed, his neverending manipulations and the revelation of his true intentions made him stand out within the readers (even more than Gon's father!)
Dude, Not Funny!: Hisoka's attraction for the kids, particularly Gon, is played for laughs yet one can't avoid feeling disturbed like Gon and Killua sometimes.
Even the Guys Want Him The male fans of the 2011 remake anime on Crunchyroll. One guy even said Hisoka was his new Waifu. They even say his Pedobear act is somehow inexplicably sexy.
Gon in canon and fanon, in canon, Hisoka is attracted to him, as he got an erection from getting wailed on by him in their fight in the Heaven's Arena Arc and in fanon, nearly 95% of the fanbase will say that Killua is also attracted to him, one could pose an argument for this in canon, but Togashi has not made any official statements on Killua and Gon's feelings for each other despite them being best friends.
Evil Is Sexy: Pakunoda, some fans have said she'd be nice if it weren't for her nose, and others find her pretty even with it.
"Octobro" for Ikalgo has become popular after his appearance in the 2011 anime.
Fandom Rivalry: With the Naruto fandom ever since both fandoms began to argue on which death is the saddest between Neji's or Meruem and Komugi's which occurred on the same month.
Foe Yay: Hisoka towards Gon and Killua, and also towards Chrollo.
Illumi towards Killua & possibly Alluka.
Growing the Beard: The Zevil Island portion of the Hunter Exam arc. And the Phantom Troupe arc takes this full throttle.
Another contender would be the Zoldyck Family arc.
God-Mode Sue: The Chimera Art King. Probably the series' most powerful character born with the best traits of everything the Queen consumed. None of Netero's attacks manage to inflict notable damage and he leaves Netero nearly dead with few movements. In the end it takes Netero's Kamikaze Attack through a rose bomb to kill him.
Jerkass Woobie: Well, to be fair, Gon did have to watch the person who inspired him to be a Hunter get his arm cut off, being turned into a puppet, confront the person that did it, broke his/her arm, and realized that the very same man would be dead this whole time... and that's not covering the battles with Knuckle and Shoot.
Memetic Mutation: Gon's Nen-powered adult form seems to have become this in Japan as Gon-san, thanks to his very odd hairdo and serious, stoic expression on such a cheerful character.
Moral Event Horizon: Several times, at least once for every villain. The Genei Ryodan are a very interesting example, as they start out on the other side of the Horizon and then slowly inch back as we learn more and more about them and the environment they came from. Then we learn what actually went down during the Kuruta massacre, which likely vaulted them back over the horizon for some readers.
Meryem constantly dances a fancy jig around this line.
Narm: Gon's Nen-powered adult form. He is an adult wearing a kid's clothes. Also, his hair doesn't appear to have an ending.
Nightmare Retardant: While the series is noted for it's brutality especially compared to other shonens, the impact of some scenes can really be lost by the crappy art work.
Shipper on Deck: Most people who see Killua and Gon's friendship also see how they dance on the lines of Ho Yay and support their relationship, Bisky even initially tried to ruin their relationship, but found herself unable to once she saw how deeply they need and love each other.
Togashi has been teasing Killua and Gon since the two met; he's even compared their relationship to the relationship of Itsuki and Sensui of his previous work, YuYu Hakusho he describes it as Killua takes after Sensui due to his attraction for the other and Gon takes after Itsuki for his Darker and EdgierCharacter Development (fun fact: Sensui and Itsuki were an Official Couple).
Pokkle and Ponzu had some hints during the initial stages of the Chimera Ant arc...which was most likely established to make their deaths all the more painful.
The original anime adaptation; most of the Filler material wasn't well liked by the fan-base.
The 2011 anime version; the early censorship throughout the Hunter Exam arc got a lot of flack for this. Episode 76 in particular got a lot of backlash due to the changes made to Gon and Kite's past relationship.
Applies to many characters that ended up being Demoted to Extra as the manga went on; even Leorio and Kurapica.
Kite. He could have stayed in Gon's group and fill Leorio or Kurapica's spot. Instead, he is horribly murdered by the Chimeras and his death is used to give Gon angst (and thus Killua) for the entire Chimera arc.
Pokkle and Ponzu, two characters who, after being absent since the very first Story Arc, are brought back at the start of the Chimera Ant arc just to get killed off almost immediately as a means to hype up the threat of the chimera ants.
Plus Kurapika, Senritsu, and others. It's a standard Togashism.
Special mention goes to Killua's younger siblings Alluka and Kalluto. I think his mom REALLY wanted a daughter after 3-4 sons in a row. It would explain why Kalluto's by her side dressed in a kimono and looking about as feminine as feminine gets. Alluka is an especially strange case; Killua refers to Alluka as female, while Illumi refers to Alluka as male.
The way this troper sees it, it is implied that Alluka is MTF (male to female) trans. Killua, who knows her and cares for her the most of their family, respects this. The rest of the family is stated not to care for her, and so they use male terms to refer to her (if they aren't using "it").
Even Illumi gets this sometimes. The biggest example was how in the South America he was voiced by a woman.
Gon getting overly emotional over the loss of Kite in the later portions of the Chimera Ant arc is seen as this.
In the same arc, Killua gets a little too sad by Gon's decisions to do things alone.
What Could Have Been: The reason Bodoro forfeited his match against Hisoka was because he whispered something in his ear, tragically, Bodoro is killed by Killua before his fight against Leorio, and what Hisoka told him was never stated or mentioned again.
Pokkle and Ponzu could have made a cute couple had they not been killed by Ants.
What Do You Mean, It's for Kids?: Even by Japanese standards, the manga (especially), and both anime series are considerably violent, especially during the Chimera Ant arc in the manga. Nonetheless, the story was intended for family reading/viewing.note Especially the Nippon Animation (of World Masterpiece Theater fame) version from 1999-2001, which tones down certain parts of the story.
Its worth noting that the English version of the manga is published under the Shonen Jump Advanced label for older readers. Something not even done with its predecessor, YuYu Hakusho.
During the latter half of the Chimera Ant arc, the reboot of the anime was moved to a later time slot.
Alluka. As creepy as she is, it's hard not to feel sorry for her thanks to being constantly left in quarantine and used by her family as a tool. By the end of the Chairman Election arc, even her alter ego Nanika gets some woobie points.
From the same arc, the Zoldyck butlers as a whole can be considered this; forced into having to test Alluka's abilities with their lives on the line which ends up resulting in the deaths of many employees anyway. People wonder why they even took the job to work for the Zoldycks in the first place.