The above video is an example of a 3D Augmented Reality figure. These AR elements can be endlessly modified. We can give the figure hair, glasses, different clothing. We can also make the model taller, shorter, thinner or heavier.
In short we can create a virtually endless variety of lifelike 3D human looking AR figures that can be rigged and animated to move like a real human.
Thus we can fill a stadium or concert hall or theatrical audience with hundreds or even tens of thousands of unique cheering fans.