By the way I don't think I mentioned it here before, so I wanted to share a good argument I saw someone make on Reddit for why Sakurai might pick Shantae over Shovel Knight for a playable character. I mean, there are lots of good reasons why, but this was a less obvious one that I had never thought of.
Shantae is just way more expressive than Shovel Knight.
Sakurai has clearly given a lot of attention to making characters as expressive as possible in Smash Ultimate. He even went so far as to draw attention to this specifically in the E3 Direct, showcasing Donkey Kong's different facial animations. It shows across a lot of different characters too.
Now go back and watch the footage of Shovel Knight's Assist Trophy. Shovel Knight looks great; it's an excellent 3D model, and it moves well and everything. But even so, Shovel Knight just looks a little stiff, and with that helmet on, there's just not a lot of room to convey emotion. When you play Shovel Knight, he still isn't that expressive, and even though I love him his personality is basically just "generic hero", but somehow you kind of read some emotion into the pixel art (which Yacht Club games is a master of). That limited expressiveness just doesn't come through in his 3D Smash model.
Shantae on the other hand was made to be expressive. Both her in-game personality and her character design just ooze with expressiveness. So her interesting