To start off, I have no problem with Krool, he is Donkey Kong’s main antagonist and a damn good one. I even wanted him in Smash, along with Funky. I wish he was used more often as he has so many gimmicks and a great personality that’s a bit more on the goofy side then say Ganondorf.
I want to preference this so I don’t come off as some angry Krool hater, but as someone who has noticed trends in Smash that lead me to believe that he isn’t going to make it.
First I want to bring up how Smash handles new characters, because (I can’t wait to get hate), they are almost always clever marketing decisions, using characters that are relevant (in games) at the time to build the roster, evening designing characters to be heavily based on new appearances from the previous and modern console generation, and this has been happening since Smash 64.
For Example;
Jiggly Puff - was put in to 64 for anime promotion
Mewtwo and Pichu - were both put into Melee for the anime (Mewtwo having a movie 2 years prior)
Roy - put in to sell FE 6
Marth - Same as Roy, but more so because he was the mascot of the franchise, so you need him along with new lords.
Ganondorf - even though Ganon was in more games, due to Ocarina being on the last console, he was chosen instead.
Zelda and Sheik - also put in for Ocarina, literally lifting their designs from the game
Young Link - put in for Majora and Ocarina
Doctor Mario - Doctor Mario 64, plus the Gameboy title was a highest seller
Falco - Star Fox 64
Zero Suit Samus - Metroid was big, and Zero Mission was a new title that introduced the character
Diddy Kong - literally like the only Rare character to make appearances in new titles after Rare left.
Ike - Radiant Dawn and Path of Radience were newer titles for FE
Wario - The Wario Ware franchise was big, so they completely based Wario on that franchise instead of Land which was practically dead. Even his design was Wario Ware thanks to early DS and Wii titles
Lucario - was part of Gen 4, the newest generation at the time
Olimar - main character from a new IP from the GameCube era, which had two titles. (Both came to Wii)
Pokémon Trainer - The team wanted Ash from the anime
Toon Link - Wind Waker
Lucas - had Mother 3 two years prior
Meta Knight and Dedede - part of Kirby’s main cast that didn’t make it in before. They appear in every title, so their inclusions were no surprise as Kirby was a big and on going franchise.
Wolf - He played a big part in Assault and Star Fox has 2 GameCube Titles and a DS title.
Sonic - In Sonic 06, which gave him a bad name that Sega tried using Smash to get rid of with positive publicity. Sonic was also a huge third party character for Nintendo and had crossovers with Mario around the time.
Snake - other than a friend request, Snake was widely known for his GameCube titles before moving to PlayStation.
Lucina and Robin - Awakening promotion
Dark Pit and Palutena - Uprising promotion
Shulk - Xenoblade was a new IP on the previous Wii system, so Smash helped promote it.
Rosalina - In both Galaxy games on Wii, plus was a character in 3D World which came out a year before Smash.
Bowser Jr. - Used to promote NSMB games, as he uses the Clown Car from that series, and has the returning Koops Kids as alts. Sunshine was entirely neglected outside of the Final Smash
Wii Fit Trainer and Miis - Market the Wii branded games, and Wii Fit had a new title a year before
Greninja - X and Y promotion
Corrin - Promotes Fates
Bayonetta - while considered the Ballot Winner, it was probably due to Bayonetta 2, which her design is based off of.
Ryu - Promotes Street Fighter V for Capcom
Cloud - FF 7 was said to have a remake in development at the time of his release, so his inclusion would build hype.
I brought this up as almost the entire roster of new comers from each game has a new title to give them backing or something recent to help do a cross promotion between Smash and their game. While I did neglect some character because, the point still stands that Nintendo usually picks new characters from recent games, hence why I don’t believe that Krool will be in. He may have popularity, but he doesn’t have anything to add to show the current era Nintendo is in and will go into. Smash is about Nintendo’s history, but it’s always seemed to be the current history, which gets added on top of the histories from previous console generations, which in my opinion, makes the rosters more interesting as you can see what games and characters were relevant through the new comers of each iteration.
With Smash 5, it seems to be going down a similar route with Inklings representing a new IP and Ridley showing the general support and newest boom of Metroid for this era.