i find it fascinating how many random controllers you can get working on the wii u with bloopair, hell, i wrote this with an 8bitdo sn30 pro for the fun of it. and yes, it was painfully slow if you were wondering.
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Can I connect an Xbox controller?
Try typing with a wii mote...it's an experience :-> i haven't tried bloopair/koopair yet but the support looks to be great