"Are there people that are so invested that would be interesting to watch without movement or motion or anything?"
Zlatin and Anki talk about conflicts and contrast in the scenes, perception of yourself on the stage, blanks as a result of going outside of yourself.
Zlatin does great stuff in Bulgaria.
Check it out: https://www.shizi.bg/soimprovfest
Subscribe wherever you listen your podcasts. You should find it just by typing "improvshine".
For video version: facebook.com/improvshine