This is not a CG mech or a static film prop. It’s a person in an amazing mech costume. I promise.
Artist XiaoQianFeng created the wearable mech costume for her brother. She uses a mix of cardboard, press wood, wire mesh, ceramic tile, and some great painting techniques. Plus some patience and time. The result is mind blowing. The video also features a simple build of a big light-up sword for the mech (or another character in its story) to carry.