Thanks for the comments! Since I JUST uploaded a new roster to my channel yesterday, I probably won't upload this one immediately, but I think it's my favorite one I've done so far.
I was originally thinking of bumping up to 50, but honestly...I couldn't think of 50 characters I could fully justify in my head. I went with 48, and added a Random and Custom (even though we have no idea what that will be like) to make the roster aesthetically pleasing.
Ultimately, I want to keep "no cuts" in this roster, even though cuts are probable in the actual game.
I get comments for Bowser Jr. over Paper Mario and Dixie over K. Rool, and they make sense, but they're out of personal preference (especially K. Rool over Dixie), and I don't expect more than one new DK character (though it could be possible).
Of course, I added back Tetra, the character I cut initially, and I FINALLY added Shulk, which I've always wanted to do.
Traditionally, after that point, I would have added Krystal or Isaac. However, I still don't think Star Fox needs more than 3 representatives in SSB. Looking at the pre-existing series I COULD add characters to, I thought Kid Icarus made the most sense, more than another Star Fox, F-Zero, or a fourth DK (since I already added to Mario, Pokemon, Zelda, DK, Fire Emblem, and Metroid). As for Isaac...he would be totally awesome in SSB, but I think Shulk is filling the kind of "role" that he would; I would see it as excessive.
As for the choice of Medusa...I think Medusa does a lot more to broaden the spectrum of the series. Like Palutena, she's a recurring character of the series, and has just as much moveset potential (I would argue more) than Palutena. I also think it makes a lot more sense from a character standpoint; Medusa causes mayhem on her own and actively participates in battle, while Palutena's main line of fighting is sending out Pit, so I think Pit on his own is enough to represent "that side" of the Kid Icarus world, while Medusa broadens the representation out. I like Hades a lot too, and I think he would be the most fun to play as, but Medusa has a recurring role in the series, and I think adding her would create a "parallel" to the representation (Pit works under Palutena, Medusa works under Hades).
However, I completely forgot that Palutena is the titular character of the series in Japan. It would be like picking Ganondorf over Zelda to represent the "Legend of Zelda" series in that respect. Hm... what do you guys think? Is Medusa viable as the second Kid Icarus character, or is Palutena REALLY that much more obvious? I'll take it into serious consideration this time.
The other idea I put into consideration was another "surprise" character, since I don't have one of my own. Ultimately though, I made the choice that Villager and Wii Fit Trainer were enough in that department, and with the addition of Shulk, the roster has enough miscellaneous newcomers (Villager, Wii Fit Trainer, Little Mac, Shulk, AND Takamaru). If I did this, my choice would be Muddy Mole.