What mouth shapes are used in Anime?

This video essay is interesting to study because it really simplifies the way we can rig/pose our anime character's lips for dialogue.
Pair it with Rhubarb addon, and we can easily make our Anime characters talk in Blender.

I will be updating GalaxyChan's pose library with these mouth poses in the weeks ahead.
Have you tried to animate using just 3 to 4 mouth poses (lip sync)?