Samhain set: Witches are the most popular costume in 2013, princesses for kids. Not making the list: The TEENAGE MUTANT NINJA TURTLES. I frankly think they were the most popular this year, since we could not find any for my son in a 100 mile square radius. I guess the best gauge for that will be so see if any heroes in a half shell end up joining Ayden in night life trick or treating..