REALLY old school G.I. Joe comic fan here. I would say it was the first comic I officially collected, and of course, Snake Eyes was the favorite character...
But Snakes Eyes was injured during a training session with the Joes. An explosion disfigured him and destoyed his ability to speak. That's why A) He stays covered up all of the time and B) doesn't talk.
That's why casting Park is genius. He can keep the mask on, and we won't hear his voice and accent which is NOT intimidating at all. Just rewatch X-men.
With Star Wars, X-men and now G.I. Joe on his resume, this guy will officially be the most popular guy at fan conventions.