https://www.gamespot.com/articles/super-smash-bros-ultimate-new-amiibo-figures-are-o/1100-6460142/

Super Smash Bros. Ultimate is bringing back an enormous roster of previous Smash characters along with a handful of new additions, and some are getting the Amiibo treatment. Ridley, Samus' arch-nemesis, is getting one of his own, along with the new Inkling and Daisy. Apparently they're bringing friends.

The Japanese Nintendo site (via Nintendo Everything) confirmed that the company is planning Amiibo for other returning fighters. Specifically, they've named Ice Climbers from the game of the same name and Pichu from Pokemon, though there may be others in the works as well.