I see people talk about how "Sakurai doesn't care about Donkey Kong" a lot. Here's the problem, Donkey Kong, the character is iconic, Donkey Kong, the series is not. Sure, Donkey Kong himself might be an icon of gaming, but outside of Donkey and Diddy, there really isn't a whole lot to work with in Smash Brothers. Sure, you all as Donkey Kong fans can see a lot from the series to use in Smash, but to an outside observer it doesn't really work. The animal companions for instance are to many people "generic rhino" or "generic swordfish". And while there are many elements from series like Fire Emblem and Kid Icarus that may seem generic to an outside observer, they come from recent games in the series, and thus are more well known to people.
To specifically address some of your points though.
-Jungle Hijinx is one of the most unique stages in the game, and showcases types of battles and environment interaction shown nowhere else in the game.
-Stages are generally what shows off what a game is most known for. So yeah DK get's jungle stages, just like Star Fox gets spaceship stages or F-Zero gets racetrack stages. And both of the new FE stages are in arenas, and Castle Siege is literally a generic castle, it doesn't come from any game. Also, 75m, although it's terrible, is a DK stage not in a jungle.
-Again, there isn't much in the way of character material besides K. Rool and maybe Dixie Kong. Both Fire Emblem and Pokemon provide a huge amount of unique and battle-ready characters. And we can't really count Lucina and Dark Pit, because they were meant to be alts for Marth and Pit.
-What assist trophies would even work? Maybe one of the animal companions, but I can't see more then one working well. DK has no assist trophies because the other series provided more characters that worked gameplay wise and had personality.
-I can not think of a single enemy that fills a slot gameplay wise and is unique enough from Kritter and TIki Buzz that would warrant being a Smash Run enemy.
-Donkey Kong doesn't really utilize any items on his adventures outside of barrels, and the Hammer and Spring are both credited from the Donkey Kong universe.
I understand that you guys might feel like you're getting ignored, but a lot of the stuff that might seem obvious to include to you guys doesn't look like that to others. I still fully believe that King K. Rool would work wonderfully in Smash, but outside of that there really isn't that much that appeals to people who aren't DK fans.
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