Wii U can use two GameCube controller adapters
GameCube Controller Adapter | Switch GameCube Adapter
Wii U Gamecube Controller Adapter〔USA〕 Brook Gaming - Official Brook Gaming Store
Amazon.com: Gamecube Adapter for Nintendo Switch Gamecube Controller Adapter and WII U and PC, Super Smash Bros Gamecube Controller Adapter. Support Turbo and Vibration Features with 180cm Long Cable : Video Games
GC Controller Adapter for Wii/Wii U (PLAY-ASIA.COM Edition) for Nintendo Wii, Wii U
Amazon.com: Mayflash GC Controller Adapter for Wii & Wii U (Dual Pack), White : Video Games
Gamecube Controller Adapter for Wii U - Solaris Japan
4 Ports GameCube Controller Adapter for Nintendo Wii U
Amazon.com: Mayflash GameCube Controller Adapter for Wii U, PC USB and Switch, 4 Port : Video Games
Confirmed: The Wii U GameCube Controller Adapter will not work on DDR, Active Life, or Cyberbike | Gaming.Fit
Smash Wii U GameCube Controller and Adapter Unboxing - YouTube
TTX Tech Nintendo Wii U 4 Port GC GameCube Controller Adapter – Gametronex.com
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4 Port Gamecube Controller Adapter Converter for Wii U & Switch [gcac037] - $19.99 : Zen Cart!, The Art of E-commerce
For Gamecube Controller Adapter For Nintendo Switch Wii U Pc 4 Ports With Turbo And Home Button Mode No Driver _ - AliExpress Mobile
Mayflash GameCube Controller Adapter for Wii U and PC USB (4 Port) - Walmart.com
Mayflash GameCube Controller Adapter for Wii & Wii U (Dual Pack), White - Walmart.com
gamecube Controller Adapter (For Switch/WiiU/PC) – YCCTEAM
Wii U Gamecube Adapter (Violet) for Windows, Wii U, Android
Nintendo Official Wii U GameCube Controller Adapter BRAND NEW SEALED! | eBay
Amazon.com: Gamecube Controller Adapter for Switch/Switch OLED.Gamecube Adapter Compatible with PC Wii U.Adapter with 4 Ports 6 FT(1.8M) Cable Support Turbo and Vibration Features Super Smash Bros : Video Games
Confirmed: The Wii U GameCube Controller Adapter will not work on DDR, Active Life, or Cyberbike | Gaming.Fit
GameCube Controller Adapter for Wii U, Nintendo Switch and PC USB – Lexuma
GameCube Controller Adapter for Wii & Wii U (Dual Pack), White
Belk Gamecube Controller Port Adapter (wiiu,nsw,pc,mac) - WIIU | The Summit
Amazon.com: Super Smash Bros. GameCube Adapter for Wii U : Nintendo Gamecube Controller Adapter: Video Games
NEXiLUX Nintendo Switch GameCube Controller Adapter for Wii U, PC USB – J&L Video Games New York City
GameCube Controller Adapter For Wii PC and Nintendo Switch
Amazon.com: Y Team Controller Adapter for Gamecube, Compatible with Nintendo Switch, Super Smash Bros Switch Gamecube Adapter for WII U/PC with 4 Port : Video Games
