I suppose I'll share my top ten newcomers, regardless if they're likely or not
10. Banjo & Kazooie
I mean, the dude was planned for 64 and Melee but was cut due to time restraints in 64 (like a lot of characters) and was cut from Melee due to the recent acquisition of RARE by Microsoft, but seeming as Microsoft has stated if Nintendo wanted to put Banjo in a smash game they'd be all for it, plus both Microsoft and Nintendo (besides being competitors in the console market and what not) seem to be buddy-buddys right now with the cross-play between them and Minecraft getting the Xbox exclusive content like the Halo-pack.
9. Dr. Eggman
I see people say make Tails, Knuckles or Shadow playable, meanwhile I'm here thinking "Why not add another iconic villain to smash" and to fill that want of mine along with giving SEGA/Sonic its second rep in smash, I believe the iconic Dr. Ivo 'Eggman' Robotnik deserves that spot! plus we'd also finally be able to have Bowser and Eggman clash with each other or against their rivals... in a non-sport minigame enviorment for once too!
8. Impa (Hyrule Warriors)
Impa is the only other character in the Zelda series (besides Tingle...kinda) that seems to be constantly reoccuring, though besides her appearance in OOT not many of her designs to be combat ready besides her appearance in Hyrule Warriors, so why not add her in?
7. Decidueye We need a grass type representative in smash ever since Ivysaur got cut, and for once it seems Smash won't be skipping a gen
eration of Pokemon this time around, so why not add the (arguably) most popular starter, Rowlet, but more specifically its final evolution, the ghost-grass type pokemon, Decidueye! I think he'd be quite fun to play with him using a combination of grass, flying, and ghost type moves.
6. Bandana Waddle Dee
I mean, this guy deserved a spot in smash 4 and didn't even get it... now some may say "He won't get in because Sakurai didn't make him" and to that I point to Kirby Super Star, the game this bandana wearing waddle dee made his appearance! Plus anyways, we don't have any spear users in smash, so it'd be quite unique to see his moveset and probably be very fun to play with as well.
5. Waluigi
Do I need to say anything? I'm pretty sure everyone has stated the reasons why this tall purple wearing dude should be promoted to playable fighter, I'd just be repeating what everyone has already said.
4. Sora
Now, here is a fighter people thought would also be playable in smash 4 due to how much he appeared on Nintendo systems, it just made sense for him to be the Square Enix rep if they ever put a character in smash... then Cloud happened and the rest is history, now I believe Sora could be given a second chance and get into smash! Though I would like to state, Sora's character rights are technically owned by Disney... so... we can have him and Cloud without it being a Mega-man and Ryu situation.
3. King K Rool
I feel like it'd be the same thing as Waluigi in here, everyone has stated everything and anything I could say, including he'd grow the DK representatives in smash and give us another (somewhat) iconic villain to play as!
2. Monokuma
Just a dream character of mine, smash in a sense is also a platform to promote games and their genres, and smash doesn't have any characters from the visual novel genre of games, and even though none of visual novels Monokuma has appeared in are on Nintendo platforms, but I think he'd be the perfect visual novel representative in smash due to all the moveset potential he has in comparison to someone like Phoenix Wright (even though I'd be fine with that lawyer getting in), but unlike Cloud, Monokuma has appeared on Nintendo systems through other game series, such as being a boss in Conception 2 and having an entire separate game mode dedicated to him in Attack on Titan 2 on the 3DS, that and if he gets into smash, we might see the Danganronpa games get ported onto the Switch, or maybe even gt the next game on there!
1. Sylux
We need a Metroid rep that isn't too disproportionate, we need a Metroid rep that's relevant, we need a Metroid rep that could be a Samus clone, we need a Metroid rep that isn't Samus! I believe Sylux to be the perfect fit, he isn't disproportionate like Ridley, he's relevant due to Federation Force (and possibly due to him playing a major role in Metroid Prime 4) and also being a Nintendo character with multiple appearances (Metroid Prime Hunters, Metroid Prime 3, Metroid Prime Federation Force, and possibly Metroid Prime 4, if it helps he was also a trophy in Brawl), he could have a 100% unique moveset and not be a Samus clone like Dark Samus or SA-X could be, and finally he isn't Samus, he isn't a form of her, he isn't a suit she wears, he's his own character... unless Prime 4 reveals he is actually a she and is a clone of Samus or something, but I doubt that would happen.