Hisoka is something called an agonophile- with slight erotophonophile tendencies, an agonophile is someone who gets sexually aroused by fighting, it doesn’t matter if there a
child or
adult- male or
female, hisoka only cares about there strength, now most people think hes a pedofile, hes not, he is not attracted to gon, hes attracted to the idea of fighting gon in the
future when hes at top shape or when hes “ripened”, thus proving my point further- now with the slight erotophonophile tendencies, ! slight spoilers! with one of the latest chapters he dies in the fight with
chrollo, naturally he rises back up from the dead and goes on a killing spree, now instead of enjoying the fight, he simply kills them, erotophonophilia is getting sexually aroused by killing someone.
p.s if you don't like Hisoka, nobody cares, honestly, just ignore it.