Using chicken wire and wire cutters (and heavy gloves!) fabricate a human shape (or close to it); cover it with papier mache, let dry at least overnight and paint. Finish with felt tunic with iron-on, welder's gloves, simple wooden sword, and make the helmet from painted poster board. The eyes are a printout of a photo I found doing a search for "eye images". Real eyes make them look creepy but cool.