Demogorgon, random idea.

C3Tooth

Honestly I dont watch the movie, and not owning him. But I just have this random thought about him.

Secondary power give him ability to change his movement style, either:

1. Move on 2 limbs
2. Move on 4 limbs (seeing less, but gain more speed, help him to chase in open space)

May be 2 forms have different terror radius & lung range too.

Seltas0208

Stranger things isn't a movie