So Nintendont was updated to support the GC adapter for Wii U. This is now possible. : r/wiiu

I created a monster, a beutiful monster. Added an “internal SSD to my Wii U as well as Gamecube Ports. And yes it works: : r/ wiiu

Official Nintendo GameCube Controller Adapter Switch Wii Wiiu - Brand New

Super Smash Bros Wii U Will Be Playable With Gamecube Controllers - My Nintendo News

Wii U - Wikipedia

Because the Wii U contains a stripped down Wii It Is capable of natively playing GameCube but due to a lack of controller, memory card and a different disc drive that was

GameCube Adapter doesn't work with Nintendont. : r/WiiUHacks

Switch to “Wii U” or “PC” mode by using the switch located on the side The GameCube Controller Adapter allows you to connect up to four GameCube

Mayflash GameCube Controller Adapter for Wii U, PC USB and Switch, 4 Port

I created a monster, a beutiful monster. Added an “internal SSD to my Wii U as well as Gamecube Ports. And yes it works: : r/ wiiu

Can You Play GameCube Games on Wii U & How to Do? - MiniTool Partition Wizard

Anyone else spent most of their time playing GC? : r/WiiUHacks

Made my Wii U portable : r/wiiu

Nintendont, Page 2017

GameCube Broadband Adapter (BBA) support is now implemented in Nintendont. You can use either a USB LAN adapter or your Wi-Fi. : r/WiiHacks

Can You Play GameCube Games on Wii U & How to Do? - MiniTool Partition Wizard

Nintendont, Page 2059