Power's blood scythe from Chainsaw man. I made this for a friend's cosplay and it is designed for a 1 inch wide pole. I used an old flagpole I had laying around but a PVC pipe should work fine.

Make sure to screw the pole attachment in first before attaching the blade because after attaching the blade to the pole attachment part you will no longer have access to the screw holes. I recommend fusing the parts using a soldering iron to make sure it doesn't snap.