Sound designer on the skins team here! Leaving some feedback as I would if this was posted in our internal review channel...
Taunt - Pretty good, really funny. Just make sure to check with VO for localization as we have to make sure 1,2,3 translates into other languages. Missing some foley of actual sit ups here, but I think you can borrow Base's.
Autos - the whoosh feels a bit too loud in the mix, I think it can be toned down just a bit. The hits are sounding great, but right punch needs a different sound from the left since it deals more damage.
Q - Stereo effect on the music could be tiny bit distracting for a non legendary skin but the value it's bringing is pretty immense. Just make sure that the volume isn't too loud since this spell is on a very short cooldown.
W - Sounding a bit close to Spirit Blossom thematically. Also On Hit center needs a more distinct hit impact sound, right now it sounds like it missed.
E - Bowling idea is geni...