How many wii u pro controller can be connected and used at the same time on the wii u? I'm about to buy 2 more (got already 1) and a friend told me it's only possible to use one at the wii u

I believe you can use 4 pro controllers

you can connect at least 4 to the console

your friend was probably thinking of the wiiu gamepad, of which only one can be connected to a wiiu system at a time.