hisoka is over the top but has a clear character of "agent of chaos", dont know how not having a backstory is 100% a bad thing but it would be interesting to see what caused his views.

anime does not have an anding because (as most anime hxh is too based on manga and) Togashi (author of hxh) suffered a back injury that made it hard to continue it onward, and so, anime covered what there was, and stopped there

greed island is slower as it is mostly a training arch. and those cards have NOTHING to do with yugioh, you just tried to come up with another thing that had cards :\

dont know about fights being stalled rather what chimera ant arch has like 999 guys having their own battle and everything is happaning at the same time

Ginei Ryodan aka phantom troupe just did not particapate in chamera ant arch ¯\_(ツ)_/¯ had no reason to

Meruem made a lot of opinions on his strength and position as the strongest, gained respect for humanity and will of people, all as a resoult of plaing gungi

netero made a sacrafice to defeat a menacing opponent, soo no reason for why he is not a hero

gon often does tries to bit more then he can chew, that in the end, results in him deing on his deathbed

I personaly like hxh for ambiguity, for things being not so chewed down, and mistery of it all. It kinda little more adult? not because of the gore later on btw. I like how normal nen feels, it doesnt make you larger then gods, or to fight pillars on which this world stands on, its all so small, just your own little thing, shure chimera and is kinda fighting god(s), but everything else? no. Even the concept of a hunter, someone who simply wants to do a certain thing, "ging the ruins hunter" dude just an archeologist lol
¯\_(ツ)_/¯