One, that avatar needs to go back to the depths of Deviantart or Tumblr or whatever hellhole it spawned from.
Two, I actually disagree. I'm not a big fan of King K. Rool, but he's much more of an iconic character than Corrin. He's appeared in all of the original Donkey Kong Country series alongside various spin-offs, and was even the main antagonist of the ever-so-amazing Donkey Kong Country TV show. Corrin is more relevant, as all of their appearances have been recent. They've only appeared in three games (soon to be four), with three of them being spin-offs (Fates, Warriors, and Smash). In their own series they're prominent, but not iconic by any means. Corrin (or any Fates character for that matter), still has yet to win a Choose Your Legends poll, which is voted on by fans of the series. They stand behind Lyn, Lucina, Roy, Ike, Hector, Celica, Ephraim, Eirika, Marth, Tiki, and many others. K. Rool is the most prominent antagonist in his series, and is the most beloved by far (with his only competition being the Tikis and Lord Frederick, he's the obviously choice). Neither are truly iconic in the grand scheme of things, but K. Rool is more iconic than Corrin. I'm sure if Corrin didn't get into Sm4sh as DLC, not a lot people would be asking for them, compared to K. Rool who is the most requested character for this game at this point.
Also I understand the warning, because that's obvious bait meant to rile people up.