Dungeons and Dragons on an art school kid's resume and/or Common App?

I am too! I’m sure that he’s going to do great things

Good for you, Mom, for trusting his instincts and allowing him with full emotional support to do this.

I also have a child seemingly on this path . … .

One other idea – the Cincinnati school of design – one famous concept artist came out of there. You can see the hard-core design elements in that work. You might want to consider this school. https://daap.uc.edu/academics/design.html

That school I believe came originally out of (or had close ties to) the car industry and you can get this machine-type of design sense from that school.

Another possibility is SUNY’s F.I.T. – Fashion Institute of Technology. I’m not sure how cheap it is for OOS students (or maybe you’re in-state?) but it has lots of design programs and business programs (and film). It’s an under-the-radar school compared with NYU or Parsons or the like. Heart of midtown Manhattan. Very good for what it does. Maybe he’d be interested in their toy design program too? I’m also not sure how to get in-state status in NY . . …maybe not that hard? (or maybe impossible, you never know)