I'm giving you a lazy response because I'm going to bed.
The fact that they picked him for use in the anime kind of tells you who is the villain of the series. You can tell who people really see as the villian.
Well, I guess Nightmare is the main villain of the Kirby series. Afterall, they chose him as the main villain for the anime, not Dark Matter, not Zero, etc.
The Zoda thing makes no sense. Zoda doesn't really do anything compared to Black Shadow (who was the advisory for 7/9 of GX). Note that this is only one cog in the machine. The popularity issue is one thing that in Shadow's favor that is not in other characters favor.
You keep overestimating his popularity as if he's one of the most popular characters for Smash 4, when he really isn't, which I will explain in a later point.
And while Black Shadow raised a bit of ruckus in GX's story mode (the only time we actually see him do something as yet AGAIN, he doesn't do anything in X that puts him above Zoda, who AGAIN, is another villain wanting revenge on Falcon for interfering with their plans just like Black Shadow), it was all under Deathborn's command.
Really, you act like he's the main villain when he only did anything in one game while following orders. How does that sound anything like a main villain?
I don't think you know how this works. We are arguing the strength of the characters. I don't need to write a paragraph to be bullish on a character a lot of people like.
Apparently stating complete facts make me being bullish.
Your assuming the reason matters (i even mentioned that earlier, which shows me you are ignoring my post).
It does. After all, Geno was only wanted because people thought he was cool and felt he was for sure going to be a lock just because he's talked about often. You can see how well that turned out.
Of course, you know little of what going on as well. Black Shadow is wanted as his own character in Japan and goes toe to toe with the rest.
You have no proof of this. Literally, the only things we have to go by is this: http://www.smashboards.com/showpost.php?p=13578371&postcount=0
Where again, "Black Shadowdorf" comes up "more than once". Nothing is said about him being his own character here.
And this: http://www.smashboards.com/showpost.php?p=14163708&postcount=87361
Where all it states is that Black Shadow is easily the favorite for a F-Zero newcomer. Nowhere here does it state that he's "toe-to-toe" with anyone. After all, it says Waluigi and Starfy have the most newcomer requests here. And we can't say it's for him being his own character, as we don't know.
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I can say that Jimmy T is far less popular because no one, anywhere, brings him up. No discussion. Does bad on polls. Fill in the blanks.
So just because you haven't seen anywhere where he's talked about means he is never talked about. Nice generalizations.
By this logic, Waluigi is pretty much guaranteed.
Most of what I'm saying you have to just understand. It has to click. When I talk about character strength, I'm looking all over Nintendo, not series by series. How memorable are they. How much could people like them. Their look. Personality. Do people want them now. Goroh and Shadow both fit this bill. What I mention is related to this and nothing more. I'm not bringing in some empirical evidence because there isn't any. Simply put, it's just what we can gauge. Your looking too much at small things (like who the real villain is. Doesn't matter) and not the whole picture.
You should have said this in the first place.
However, while Goroh and Black Shadow both "fit", this does not give any indincation that both together are any likely.
Black Shadow's best chance would have been in Brawl, as characters were being decided in 2005-2006. The anime recently ended in 2005. If Sakurai really found worth in Black Shadow, he would have been a character or at the very least, an Assist. He was neither.