https://www.gamespot.com/articles/smash-bros-ultimate-getting-gamecube-style-wired-c/1100-6460810/

Third-party peripheral company PDP has announced a series of stylish Nintendo Switch controllers modeled after the classic GameCube button layout, for use with the upcoming Super Smash Bros. Ultimate. The series of three controllers feature different color schemes and emblems to signify some choice characters: red for Mario, blue for Link, and yellow for Pikachu.

The button layout is identical to the original GameCube's, with a few minor Switch additions like the Home and Capture button. A detachable C-Stick can be swapped for a full-size analog stick, depending on how devoted you are to the old GameCube look. Nintendo has already announced its own official GameCube controller as well, and originals will still work, but those require a separate adapter. The PDP ones, by contrast, have a 10-foot USB cable to plug directly into the Switch like any other USB controller.