Not Donkey Kong, Yoshi, or Bowser. It looks like the non-human characters didn't get tennis attire. Which is odd considering we know that the non-humans can wear sporting outfits...I for one think it's pretty cool that everyone (not just the princesses this time) gets tennis attire in Aces. The last game to do that was Mario's Tennis on Virtual Boy.
If you pay attention, they reused voice clips from the intro of Mario Power Tennis, 15 years ago! This cutscene also alludes that Wario is still treasure hunting.
They just did this. Can't even complain about how long it took, because it looks awesome!
Still, impressive how they kept the recordings intact, specially the one where Mario shouts: "LUIGI".A pleasent surprise and I certainly liked it, but geez that's the worst any Mario game has ever been with reusing voice clips.
By that I don't even mean them reusing clips at all, but the ones they chose, they even still have Waluigi's 'he walks funny' from the Power Tennis intro, while he and Wario find the treasure, that's hillariously bad.
Still though, really nice this is a thing and the sight of Wario and Waluigi treasure hunting gives me life.