Ninjas are simple, and consistently popular among the kids, you don't NEED the mask.
Men in Black
Insert superhero here (most don't need mask/makeup)
Depending on which video games he plays, there's probably a character he likes...
At his age, he's DYING to wear a mask... How about a headpiece? There are some really good Frankenstein and Devil headpieces, that look great combined with make-up. If you're really created, you cyan make an appliance. We did a Quasimodo eye/cheek appliance for my son when he was around that age. He was a Mad Scientists Lab Assistant in our walk-thru that year. He also had a hunchback cushion under his "Notre Dame" sweatshirt. It was a real hit...
Thanks...so many great ideas, and he is really excited about a couple of them!! I have an older daughter, and it has never been a problem. She didn't even go out last year to TOT, and she still dressed up just to hand out candy with her friend!
- Is he into any video games? My son is going to be a TF2 medic. We got a cheap lab coat + red gloves from Amazon and he is making the medic's pack out of cardboard boxes and a 2l soda bottle.
- Is the into anything like Homestuck or Nightvale? A Nightvale intern costume could be a purple shirt + an iron on Nightvale patch (printed using iron on patch paper)
-Puns and memes are really popular -- one of my son's friends (a redhead) was a 'ginger' bread man, a black shirt + Go Ceiling = ceiling fan, etc.