I like Kid for several reasons.
First of all, because he seems more like a real pirate version of Luffy. He doesnโt need to befriend everyone, he doesnโt go for that romantized adventure, or he simply doesnt get it presented like Luffy.
Also it is very nice to see his interaction with his crew. Its clear they are a bunch of friends which stick together since they were kids. They are not like the most crews, put together by time or conquered, they are friends, which fight their way together through this world. Thatโs also why Kid has no problem at all to lose an arm to safe one of his mates.
But what most importantly took me for him, was his will and unbreakable character. He never had a legendary lineage (as far as we know), he never had a legendary grandpa preparing him, he never had the plot armor of doom through the whole series, he never had the whole legendary ensemble carrying him through the world, he never had a legendary trainer which focused on him for 2 years, never got some magical legendary weapon, never got a godlike DF and never was the favorite of any high tier character, which suddenly supports him out of nowhere, so a real fight becomes a trainings lesson.
But still, he was going forward, he still worked for everything and took it for himself and his crew. He fought for it with unbroken will. He lost an arm to Shanks? Fuck it. He lost to Kaido? Fuck it. He was inprisoned in Udon? Fuck it. He always went further and took everything he wanted.
And now? Now he has 3B bounty, is in competition with Luffy, is declared alongside Luffy and Law as the biggest threat of the new generation.. Not because Rayleigh trained him, not because his father is the most wanted man in the world or his grandpa is legendary, not because he has the Sungod-DF, not because Shanks kisses his but since his birth, not because he gets favorite by Morgans and not because a got a magic sword. No, because he fucking fought for it, because he puts in everything he has, he goes all or nothing. And he earns what he gets, by his own bare hands.
Thatโs why I root for him. Because he does it by himself and his crew. He fights for it, because he wants it and he donโt backs down.