Mermaid Hunter is made of EVA foam, PVC pipe, upholstery foam, plastic, and metal. The gears on the chest move and he has a bubble machine on his back, to give the appearance he is under water. Also has blinking lights on the head and strobe light on the back to light up the bubbles. It is painted with spray paint, and hand painted to add weathering. The reason he has a crotches is because he ripped his ACL a week before this costume contest. Because he worked on this costume for three month he didn't want to miss this contests.
8 minutes in the video you can see the costume on stage. And see it in full action.