@frostclaws Yes, as it turns out. quite a few in fact. http://www.mayflash.com/Products/NINTENDOWiiU/W012.html
@frostclaws okay turns out that's the only one I can find lol, but apparently it works natively on pc, and that's an updated version of a much earlier one they did that just had two ports. This one also works on the Nintendo Switch and Wii U as it turns out as well as PC. nice!
@Nine @frostclaws the mayflash one is nice yes
you can also use the official nintendo gamecube controller adapter for the wii u or switch in dolphin
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@frostclaws @Nine not out of the box, there may be custom drivers or something
the mayflash adapter has a switch to change it between xinput and switch/wiiu mode though so you get the best of both worlds
also the official one is excessively expensive last we checked
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@frostclaws @Nine i feel like the mayflash adapter is probably easier and more versatile (especially if you later get a switch; you can then use the gamecube controller as a switch pro controller though it's missing the second Z button)
you can hook up wii remotes with plain old bluetooth too
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precautions regarding gamecube controller adapter
@frostclaws @Nine if you're wondering why it has two USB plugs by the way it's because running the rumble motors on gamecube controllers requires more current than one USB 2.0 port is allowed to supply, so the grey one is used only for powering the motors and the black one is used for powering other stuff and for communication
iwrc you can use it with just the black one plugged in but you won't get rumble out of it. note that you should *absolutely not* plug the two leads into different devices, even if you're low on usb ports. I don't know if they're linked together anywhere inside the device but if they are doing that can fry your USB ports because the two things are not going to have exactly the same +5V rail
(if you're low on usb ports and want to use rumble, look into getting a powered usb hub--that's a usb hub that, instead of passing the power straight from the computer, has its own external power supply for the outputs. They're really handy to have)
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@frostclaws @Nine though all of this is hypotheticals because you should probably wait a bit before buying any more stuff!
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@frostclaws @Nine (incidentally, this is the one you'll want: https://www.ebay.com/itm/Mayflash-4-Port-Adapter-for-GameCube-Controller-to-WiiU-PC-Smash-Brothers/251790398554)
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