How are the faces animated in Zelda?

I'm currently working on a project with a small team to create a game and the person who invited me wants to make me the 3D modeler and the rigger of the team. She wants the characters to have some sort of face swap mechanic, but without having the rig the face. How exactly would this work? Would I create this in a 2D animation software such as Adobe Animate (animate two different expressions) and swap out the faces using some sort of script?

I'm not sure how to even approach this, so any help would be appreciated! Thanks~

 

That is one good way to do it.

Or, "I haven't used this method yet," use a texture atlas with all of the face expressions on it, with a script attached to it that changes the facial expressions.

 

Oh! I didn't even consider that! Sounds like a good idea. I'll have to try it out and see if it's possible. Thanks for the reply

 

Alright. No probs.