Can Ready Player Me characters have facial animation?

I see that you can download the ARKit morphs. How would this be set up to work in Unreal?

Hello!

They can indeed. In Unreal you just need to set the morph targets, you can of course do this with proper animations and driven by game logic but just as a super quick example I set two morph targets within the AnimBP here

Full list of Morph Targets is here Apple ARKit | Ready Player Me or you can see them all on the RPM_Mixamo_SkeletalMesh under Morph Targets