Good answers
I’ll ask it a different way... if King K is your main, what character do you enjoy second most?
In Ultimate, I solo main King K. Rool, and he is my most played character by far. However, I mained Charizard in Project M and Smash 4, and he feels the closest in playstyle to King K. Rool from my experience. Both King K. Rool and Charizard have good forward airs to kill with, their up specials go straight up and have a hitbox, all of their throws are useful, Rock Smash is essentially a counter like Gut Check, their airspeeds are both slow, they can create space with blunderbuss, krown, and Flamethrower, and more. Altogether, they do play differently. I think King K. Rool is better at neutral, combos, and applying pressure, while Charizard has some nasty read options and good range. But a few Charizard stuff I did in Smash 4 carried into my Ultimate King K. Rool play.