We created 80 low-poly and mid-quality NPC heads to be used as crowed for an unreal engine game. In this project, we created male, female, and child heads from different races such as Middle East, Russian, Asian and African.
Also, we modeled 80 cloth sets for these heads. In this way, you can assign each head to any cloth and achieve a huge amount of variation.
These characters are rigged by default unreal engine Mannequin skeleton.

You can see real-time renders of some of the heads below.