Question to y'all who should had made the cut and why? Me.
Black Shadow - F-Zero needed more representation. Plus he's a villain which would had been welcoming.
Elma - We just need another badass female like Samus and Elma definitely fits that role.
Isaac - Just for the Golden Boy fans. They've been waiting for him just as long as the fans and I had for K. Rool. I feel it ain't fair we got him but they didn't get their character. This is the only time I feel Sakurai screwed the pooch and it felt like he trolled them because all those months of thinking he was a lock only to reveal his deconfirmation at the last minute rather then earlier saving them all the pain and salt.
Leon Powalski - I love my reptiles. That and the StarFox reps would be perfectly rounded both Fox and Falco having their rivals.
Medusa - Would had been great getting a female villain into the roster. That and I think it would had rounded out the Kid Icarus reps perfectly.
Nightmare - Not only because more villains would be fun but he'd also be the first third party villain and it'd return the favor of Link guest starring in the GameCube version of Soulcalibur II especially being Namco has been working on the Smash series since the fourth game.
These were really the only ones I can think of...
Dixie Kong - A character that I'd argue, is more prominent and more well known than K. Rool is.
Bandanna Waddle Dee - Has become a mainstay in the Kirby series, as well as a fan favorite.
Rhythm Heaven Rep - A weird omission from Smash, especially assuming it's pretty successful in Japan, and Sakurai is a fan.
Steve - Minecraft is one of the most important games of the last decade, and it's already made a name for itself on worldwide appeal, appearances on Nintendo's consoles, and legacy. That, and Sakurai's a fan. Oh... Also, lot's of potential for a moveset.