Kind of. I did mean the Disney (Mickey Mouse stuff) and Looney Tunes kind of toon physics.
Also, I forgot to mention this, but when you said what you said about types of characters, I must say; I, for one, think it is quite fun to use types as a way to talk about what characters should get in, based on that type of course. We don't always have to talk about specific characters, and to be honest, I find talking about characters in more vague ways (and trying to determine which character of that type would work) to be fun.
I feel like the Closet Character that could do the Toon Physics concept is Cuphead actually, since his own game is based on the Cartoons of that Era were Toon Physics were really prominent.
Of course to be he honest, If you do want to put in a Character that does focus on those type of Physics, you might as well do the one that started it all
If Shadow ever gets into Smash, I'm kind of hoping they add in music from Sonic Adventure 2 and Shadow the Hedgehog. His stage could either be the Space Colony ARK, Radical Highway or Westopolis.
I dont think they would add a stage for him since he'd most likely be a clone of Sonic
So on Shadow
So one thing I could say about Shadow is that with him, I know exactly what Specials he would have and where they would be Placed, since I think he has exactly 4 Unique Techniques when it comes to his Chaos Powers
Neutral Special: Chaos Control
Side Special: Chaos Spear
Down Special: Chaos Blast
Up Special: Chaos Warp
Now the thing I think makes Shadow Tricky when it comes to actually implementing him into the game is Combining his Power Set with the Fast Gameplay of Sonic Series fame, especially since Shadow Specifically is a more Aggressive, straight to the point type of Fighter compared to Sonic, in a balanced way. Sonic Himself already is hard enough to Balance I think just because of his Speed
However Beyond the fact that I just really like the Character, the reason Shadow has been my Most wanted for so long is that if they did pull it off, Shadow would probably be one of the Coolest and Fun characters added to Smash gameplay wise, both for Casuals and also for Competitive. Which is why I've been adamant about a Clone Shadow being an bad idea.
A Hyper Aggressive, Flashy, Fast, Strong Rushdown Fighter that has the ability to Control alot of Space and even Time sounds overpowered, but It's Also a Fighter that people already know would be fun. It's also one that people Wished Sonic could be (The Hyper Agressive rushdown part)
I do think Shadow could be Balanced though. I think the Main thing would be making his Chaos Moves have Extreme Strengths, but Extreme Weaknesses if countered correctly
Chaos Control is a Time Stop move that's
Specifically NOT a counter because you'd actually want to hit him, since if you do, Shadow gets Stopped in time Himself instead (He'd also have the emerald when he's doing it as an easy visual for what he's doing)
Chaos Spear is a Projectile move good at Covering Space, but could be Reflected back easily (which fits better on a Character like Shadow with his Mobility than one Like Ganondorf)
Chaos Blast is a an Explosive Move with Great Destructive power, but can easily turn Shadow into a Bomb himself to Launch if he is intercepted in time.
Chaos Warp being a Teleport that Doesn't go into Freefall, and be used multiple times in Succession, would be good for doing combos and Laying down aggression, but the requirement to hit an Opponent to reset the Teleport and it's natural short distance makes his Recovery in a Defensive position lacking
I'd also make it that Shadow's Speed actually follows the Canonical formula for how Sonic characters speed actually work in the games. How Sonic moves in Smash is actually not accurate to the games since he needs to Build himself up before he can reach high speeds, But Sonic's Initial Dash is So Fast it ignores that build up outright. You a
Making Shadow's Initial Speed slower but his Top Speed Fast would make it so he can be Fast when he's Aggressive and going towards you, but Running (Skating in Shadow's Case) away would be unincentivized and easy for the Opponent to catch you.
For Stages and Music, Even if it's not the Ark Specifically, a Space type of stage fits not only Shadow but the Sonic Series perfectly since Space is a common environment for Sonic characters. and I think beyond more Shadow specific tracks, more Stage themes from Non-Classic era games would be perfect, especially if they are going to continue to only have the first verses for the vocal tracks