It has been a long journey for fans of King K. Rool such as myself. Nearly six and a half year has passed and we still do not know anything in regards to King K. Rool fate in Super Smash Bros. 3DS & Wii U. No indication of what Sakurai thinks of King K. Rool, nothing aside from a trophy, he really is a character we don't know the thoughts of from the man that has brought Super Smash Bros. into existence. But despite how little we know about Sakurai's thoughts on playable King K. Rool and his absence in Donkey Kong Country Returns and Tropical Freeze, fans have remained strong and have not given up.
Those who were around pre-Brawl may recognize that Diddy Kong was among the Top 10 most wanted characters worldwide for Brawl. The push for Diddy Kong's inclusion was massive and relentless as characters, especially since so many were disappointed when he did not get into Melee. When Diddy Kong was confirmed, so many fans around the world celebrated his inclusion as one of the most wanted Nintendo characters had finally gotten in. It was then when King K. Rool and Dixie Kong started to rise in demand with the bigger push going towards King K. Rool. As a matter of fact, many assumed that a third DK character would happen for Brawl and many were disappointed when they figured out that wasn't the case.
Six and a half years later, King K. Rool's future in the Donkey Kong franchise seems uncertain. King K. Rool has been absence ever since Super Mario Sluggers, having not appeared in Donkey Kong Country Returns or Tropical Freeze. Many are worried that King K. Rool is dead and is never returning. Despite this, there is most certainly hope for King K. Rool's inclusion in this game.
King K. Rool is likely the third most wanted character for this game and as such, the most wanted Nintendo newcomer. Not only is he extremely strongly wanted in the West (behind only Mewtwo, Mega Man and probably Ridley), he's also highly requested in Japan; a feat that few characters have accomplished (by contrast, Ridley is barely even requested there). Sakurai does take fan demand into account (although how much remains to be seen, though he certainly did it for Mega Man), so this is likely going to be enough for Sakurai to note.
K. Rool's recent absence does not diminish his importance to the franchise. After all of these years, he is still seen as the main villain of the franchise; he has appeared as the antagonist for the majority of the Donkey Kong games; including the trilogy, DK64, the Donkey Kong Land games, DK King of Swing, and DK Jungle Climbers. Other villains of the DK franchise simply cannot compare; no one has appeared as the main antagonist more than once and as such, have not been able to successfully replace K. Rool as the main villain. As a matter of fact, Tiki Tong and to a greater extent, Lord Fredrik, have inspiration from King K. Rool. There's also
speculation that the rock here looks similar to King K. Rool. The Banana crown looks similar to King K. Rool's crown, so while it hasn't been confirmed that the rock was meant to look like King K. Rool, the similarity can't be denied. Regardless, Retro Studio haven't forgotten about King K. Rool and it wouldn't be surprising if they returned in DKCR3.
Another thing to note is that Kremling are appearing in Smash Run. For the first time in nearly six years, we have seen Kremlings appear. What makes their appearance important is the fact that like K. Rool, they have not appeared in years and we have yet to see any other types of enemies brought back like this (other enemies have been making recent appearance). Clearly, it'd be very surprising if K. Rool was just a trophy in this game so this almost certainly means King K. Rool is going to receive a larger role in Smash. An Assist Trophy role seems unlikely as well since it'd be strange for the Kremling King to be an Assist Trophy while there are enemies as well. At this point, we are probably looking at either a boss role or a playable character here, which no indication of what it is. However, with him being probably the most wanted Nintendo newcomer, being the primary antagonist of the DK franchise, and really no legitimate counterpoints against him, he has a good shot of being playable. The only question at this point is if Sakurai sees him as worthy of playable status.
I am very hopeful that I am right here. King K. Rool has been among my top three most wanted characters here for the past few years (ever since I first became active in the speculation scene in June, 2011) and I have wanted him for even longer. Now that Mega Man is in, King K. Rool is currently my most wanted character. As someone who loved Donkey Kong Country, DKC2, and DK64, I have always liked King K. Rool as a villain and very much missed having him around. DKC was likely one of the first games I've beaten on my own (and the first SNES title at it) and have particularly fond memories of that title. It was great to see Diddy Kong finally appear in Brawl (despite not playing as him too much, he is my favorite Donkey Kong character) and I hope that King K. Rool will follow with Super Smash Bros. 3DS & Wii U.
Very soon could King K. Rool's role in the next Smash game be disclosed to the community. It is possible that E3 2014 will show off the entire roster there for hype purposes. There's also the possibility of mass dis-confirmation occurring just like in the Smash Direct so even if the roster doesn't get entirely shown off, fans should watch out for K. Rool's role there because it is possible that he either gets confirmed or disconfirmed as a playable character. Plus there is also the chance that if there are more newcomers beside the eleven that Sal Romano has leaked (the unconfirmed being Mii, Pac-Man, Chrom, Shulk, Palutena, and Chorus Men) that Sal will leak the last batch of characters for this game. This final leak, if true, will determine whenever or not King K. Rool is playable in the game.
Regardless of what happens, we as fans will stick together until the very end. The Kremling King is counting on you to make his come back finally happen. Say it with me:
KING K. ROOL FOR SUPER SMASH BROS. 3DS & WII U!