Using sprites for a 3D character's face?

Unity Engine
1

The best example of it I can think of is Wind Waker, where sprites are used for the characters’ faces and expressions (at least, that’s how I think they did the faces).

I was wondering how you’d go about doing this in Unity. I don’t have any experience in using sprites in Unity or how to use them in a 3D environment and couldn’t really find anything in my searches talking about using them like this. But it is something I’d like to do in the near future for my project and I’d like to keep it marinating in my mind while I work on other things first.

So, does anyone have any experience/tips/tutorials/demo scenes/etc. on using sprites in this way?

2

Possibly - have a camera hidden away, looking at the animated, flat plane face. This goes to render texture. Character has a feature less face, just textured with skin/whatever. Just in front of that is a curved plane. The camera’s render texture is used on that.
Should work? Quite likely quicker ways, but this seems the most straight forwards (if you’ve got pro)