K. Rool was as popular heading into Brawl as he was heading into SSB4. And that's really saying something, considering that the only other characters who were in high demand for Brawl who remained just as wanted for SSB4 were Ridley, Isaac, and Mega Man.
He's as far from a bandwagon character as you can get. If you want to see a bandwagon character, look no further than characters like Shantae who got a massive following out of nowhere. Or ones like Geno and Krystal who were massively popular Pre-Brawl and now only have a fraction of the support they once did.
We
still have people acting like there's going to be more Mario Kart 8 DLC?