It's been a full week since the direct. I'm noticing lots of new possible characters since then.
I was dead wrong about Ashley, I thought her popularity alone would be enough. I'm not crying about it though, I was never interested in her. We've known assist trophies being MIA doesn't necessarily indicate anything new in store for them, so I'm hoping more get revealed soon. Was also wrong about Mimikyu, thinking it was the most likely Gen 7 rep, but I'm again hoping in vain that other popular Gen 7 mons are in the same boat, cause I'd prefer a surprise Pokemon.
The demand for more Zelda characters is something I think Sakurai would notice, so Skull Kid and Tetra as a Toon Link echo are the two most obvious newcomers I'm betting on right now.
Shadow, Isaac, Isabelle, and Bandanna Dee are my next safest bets. Just like Daisy, Shadow is a popular character who works as a clone of another character, but has a different personality. Isabelle and BDee are relevant characters from a major first-party franchise who could appeal to a large fanbase. Isaac's AT being missing left some fans really upset, and he has been requested for a long time, which are a couple of things Sakurai may have noticed. And the screenshot he posted looks waaay too much like an intentional reference to Golden Sun.
Rex and Prince of Sable are my least sensible predictions, but still ones I consider a safe bets nonetheless. I said there wouldn't be a retro character, but I do think the Prince has a genuine chance. Takamaru seemed like the most obvious retro choice, but I suspect he was left out for other issues on top of being mostly known only in Japan. Prince of Sable fits the swordfighter archetype that Sakurai clearly favors, his ability to tranform into animals seems like something Sakurai would want to implement in Smash, and his abilities are so faithfully translated into Smash, it gives the impression Sakurai really did the research for him. He feels like a character that appeals to Sakurai in so many ways, his obscurity would be simply be overlooked. Rex is just as hard to defend, but would make sense for marketing. At the time, there was nobody else who would be the protagonist of upcoming entry in an established franchise. As experienced businessmen, every big developer at Nintendo knew the failure that was the Wii U had nothing of notable impact outside of Splatoon, and would be looking towards the potential of the Switch to do better. The success of Switch titles was not guaranteed, but the potential would still have been there; the same can't be said for the Wii U, which already was established as a failure at that point in time.