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first and foremost reason he is a prevert and the other reason stated above by ace, you see the arc of the three brothers left a pretty deep standard for kids in one piece as an anime watcher and manga reader, like the three of them did things which could be said ridiculous and don't counter it saying ace being rogers son and luffy being dragon's son and garp's grandson,sabo was an normal noble's kid logically speaking as an hier to shogan and oden's son momonosuke is trash
It confirms this man just like chaos too much
jack is immortal too and his powers weren't limited like the other guardians he doesn't need people to believe in him for his powers to work,he controls a concept itself it's like as long as there is winter jack will be there too and the winter never ends
well he has jack and he is spirit of winter kind of that covers most parts