Point of View (POV) — Change the Label or Status field to POV and add a value for each of your POV characters. Again, if you want to see this represented visually on the Corkboard or Outliner views, use the Label field in order to add a color to each value. Otherwise, the Status field works nicely here.
Unsure how labels work in Scrivener? Jennifer's excellent article shows you that you can use them in any way which works for you.