Hi, the person animator is more or less a player for build-in premade animations. Now we have 3 completely diferent kinds of animation systems, 4 if you would count Timeline. The other two are recorded animations and Animation Patterns. I bet it will not be the last system in VaM.
In the person animator tab, you can add multiple of those premade animations to the list and they will play one after another. By combining them, you can easily create some cool scenes. If you save the scene, those animations will be saved, too, and will start when the scene is loading.
I use this only for quick scenes, where I don't want to tinker around with complicated stuff.
Place a girl on the bed, give her some of those idle laying animations, save it and ready you are. Or a dancing girl with cool lighting and music. Despite being so simple, it can look quite nice.
You can also trigger some of those premade animations by buttons, for instance. No need for recording.