Seriously remove Ralph and Wheeler... An original character has more chance and sense than these two.
If you want another F-Zero rep, Deathborn.
Don't like the choices, do your own chart.
Wheeler was the only other major protagonist of the alternate continuity other than Falcon (essentially being the only major protagonist in ANY F-Zero continuity that isn't Falcon himself, but at the same time he becomes the new Falcon anyway...), which had two games of its own, the latter of which being a continuation after the anime where Rick is the new Falcon.
Before you bring up that he debuted in the anime, bear in mind that Lucario debuted in his movie before he was in any game, yet was perfectly acceptable for Brawl.
Wreck-It Ralph is kind of a strange issue. On one hand, he is a movie character, but on the other, there is the fact that the Fix-It Felix Jr. arcade game he came from was defictionalized months prior to the movie's premerie, thus
technically bypassing Sakurai's rule that a guest MUST be of video game origin.
There is also the fact that there was a deal with Sega to where Ralph would be in Sonic and All-Stars Racing Transformed in return for Sonic to have a plot relevant role in the movie. The director mentions that for the planned sequel, Mario is planned to make an appearance, which could possibly mean a deal with Nintendo to include Ralph in
their crossover. (Nintendo is also seemingly supportive of Ralph, as when the movie lost the Oscar to Brave, they posted on their Facebook an image of Bowser upset that Ralph lost.)
Now, this wasn't enough for me to add him to the chart initially, but then....THIS came up....
http://www.cinemablend.com/new/Wrec...er-Smash-Bros-Possibilities-Sequel-36068.html
Now, ignore the title of the article, as that is heavily misleading, but the director of the movie has tossed around ideas for the sequel, and he directly mentions possibilities of "Super Smash Bros. type games", which seems to hint that the idea of Ralph being in Super Smash Bros. had been discussed at some point.
This makes Ralph a
possibility, but like Bayonetta and Layton, there is a lot going against him to where that's all he is until further notice.