Don't really get why people don't want Shadow. Well, I'm on the defendant stand, and my hair sorta looks like Phoenix Wright's, so I guess I'll argue for his case.
He's just an edgy Sonic!
Is he edgy? Sure. That was intended upon his creation. But when people boil his character down to an edgy version of Sonic and nothing more, then either they didn't play Adventure 2 or didn't give a **** about the story and dialogue. Shadow was created to be the Ultimate Life Form by Gerald Robotnik, not to destroy Earth but to find a cure for his daughter Maria, who had the Sonic-world equivalent of AIDS (Nuero-immune deficiency syndrome, or NIDS for short). The three of them lived on the Space Colony ARK, overlooking the Earth. Shadow became like a brother to Maria, and she was the closest he ever came to loving someone-that is, until the government raided the ARK and killed Maria. Gerald, in a blind rage, forgot his well-meaning goals and, not only did he set the ARK on a crash course to Earth when it had all seven Chaos Emeralds, he also wiped Shadow's memories, and made him think he had to commit mass genocide on the planet to avenge Maria.
For that alone he has more than enough reason to be angry sometimes.
When Shadow is taken out of the ice by Ivo Robotnik AKA Dr. Eggman 50 years later, he aids Eggman and Rouge (secretly a good guy) in collecting the Emeralds so they can wipe out Earth-and this leads to frequent encounters with Sonic, Tails, and Knuckles. Shadow may seem like an edgy Sonic, but there's more to him than that. Like when Rouge is trapped in the G.U.N. island that's set to explode, even though he won't gain anything from it, he saves her with Chaos Control. Or when he finally does regain his memories, as the ARK is heading towards the Earth, he teams up with Super Sonic, unlocks his own Super form, and sacrifices his own life to save Earth and fulfill his promise to Maria-to give those on Earth a chance.
There's plenty more signs of him being a tough, quiet guy with a soft inside throughout the series. In Heroes, he gains the friendship of Rouge and Omega, who later become his two best friends-think of Team Dark as a friendship circle of social outcasts. In his solo game, he saves the world again and vows to leave his past behind and become a better person. In 06, he joins G.U.N. to show he really has forgotten about the past, and helps Silver save the future by traveling with him to the past. The only times he is edgy and edgy alone are certain parts of Shadow The Hedgehog, and the meta era of Sonic (in which he's presented as edgy, not for his character but for marketing purposes. Really dislike these new Sonic writers btw).
I know that was a long explanation but believe me, it needs to be a wakeup call to those who think he's a bad character and a bad candidate for Smash. But wait, there's more!
We already have three Sega reps, we don't need another one!
For Sega characters as a whole, Sega is also an extremely important third party developer. They may have fallen from their first-party days, sadly, but anyone who could even raise a
finger to Nintendo's grasp on the 80's and 90's videogames market should deserve more recognition in Smash than just three fighters.
Okay, but not from Sonic! There are way more Sega franchises to choose from!
Oh I'm sorry, I couldn't hear you, I was listening to the soundtrack of Sonic The Hedgehog, the most
influential and important game of the 90's. Sonic deserves at least two or three reps in Smash, like it or not. Comparing his popularity to, say, Fire Emblem (8 characters) and it's pretty imbalanced. Not saying FE doesn't deserve that many reps, it's just blown way out of proportion compared to franchises like Sonic. Yes, there are other Sega characters to choose from-such as Hatsune Miku, Kazuma Kiryu, a Sakura Wars character, NiGHTS, Axel Stone, B.D. Joe, Arle-but those franchises pale in comparison to the popularity and importance of Sonic (except for Miku of course, she definitely rivals Sonic there).
Okay, but not Shadow! What about Tails, or Knuckles, or Eggman, or Metal Sonic, or Amy, or Blaze, or Silver, or Big, or the Chaotix, or.........
Fair point, but I'll shoot it down real quick.
It is true that Tails, Knuckles, Metal, Eggman, and Amy hold a lot of importance to the series and predate Shadow. They also have a decent amount of moveset potential (not that it matters much). So let's go through them one by one.
Metal Sonic: He hasn't appeared in a single canon Sonic game since 2003's Sonic Heroes, whilst Shadow has a major role in 2017's Sonic Forces. Also, Metal is just the less cool rival to Sonic. 'Nuff said.
Amy: She also hasn't done nearly as much for the series as Shadow has. I also believe Shadow has been playable more often in the mainline games. Plus her only abilities come in the form of her hammer, while Shadow has hand-to-hand combat, weapons, Chaos powers, etc.
Tails: He actually does hold a decent light to Shadow in terms of who could get in first. However, Shadow has a few more things on his side than Tails does which I'll go over in a minute. But along that, Tails was made into a Mii Costume DLC. If they're making his costume a DLC costume and not base game, when it was already in Smash Wii U, means he won't be a DLC fighter (probably).
Knuckles: Same argument, plus the DLC costume stuff. I'll explain here soon.
Eggman: Okay, here's that argument I was talking about.
Shadow is the favorite character of series director Takashi Iizuka. If Sakurai were to do the same thing he did with Min Min, he would ask Iizuka what character he wants in Smash, and then we have our winner.
Sakurai possibly has a thing for edgy characters. He created both Meta Knight and Dark Pit (a darker version of an already existing protagonist-sound familiar?).
His AT model would need some more polygons and detail in general, but they obviously wouldn't have to do as much work to get his fighter model. If they can't do that, they can still just build off of Sonic's.
Plenty of characters have broken boundaries before. Chrom appears in a final smash and is a fighter. Proto Man is in a final smash and has a mii costume. Min Min is a spirit and a fighter.
Bomberman was made into a Mii Costume that looks just like the normal Bomberman Assist Trophy, and has eight color variations-so obviously, Sakurai is seeing how we might react to an AT upgrade of some kind-and that could mean he wants to take someone like Shadow and make them a fighter.
If that's correct, then Shadow has a good shot at being chosen.
He's the second most popular character in the series.
He's extremely popular amongst Smash speculation.
He had a super-prominent role in Sonic Forces, plus he was featured in Team Sonic Racing as a playable character.
He has a really good chance of getting in, possibly as much as Eggman does or even more so.
Finally, here's the dumbest criticism:
He would just be an echo of Sonic!
Why is it dumb? Because this.
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My full Shadow moveset. As far as I can recall, he shares two moves with Sonic in this set and that's it. Enjoy.