If you are looking for a helpful feature for a Tweencraft-style animation app (or a "repack" concept for PC), the single most impactful feature would be
(exe), you can use it on a computer using an Android emulator Note on "Repacks" "Smart Skeleton & Auto-Lip Sync Engine
You can easily drag and drop script notes or external images from your PC folders into the animation workflow. "Smart Skeleton & Auto-Lip Sync Engine