There are a ton of different ways to make your own FNAF cosplay masks, so the best (and most generic) answer is—use the materials and techniques you’re most comfortable with. That said, I’ve noticed that a lot of FNAF cosplayers and tutorial-makers that make lifelike looks favor foam over other materials. Foam is relatively cheap, easy to mold and carve, and light enough to wear without sacrificing your mask’s structural integrity or aesthetic. However, paper, plastic, and even the right types of wood can work well for creating the perfect mask. I love Andiematronic’s tutorials for foam heads and bodysuits, but remember: the more lifelike you want your cosplay to be, the more time, effort, and hot glue you’ll need to put into it!