This is a paid asset, but now you can download Low Poly Civilian Character Pack for FREE, but please remember this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Detail this asset from Unity Store: Original Link
Low Poly Civilian Character Pack v1.0
Civilian characters with (23) animations comprised of various idles, walking animations, running, strafing, various types of attacks, various death animations, and two getting struck/hit animations.
The 3D mesh is 506 quad polygons
(8) 512×512 PSD Diffuse textures allowing for eight fully unique civilian characters. The models are optimized in bone count and polygon count to be ultra efficient for iOS and Android mobile platforms. Included in this package are the two main Civilian models (male and female) and all 23 of the associated animation models. The animations are all applied to the main two Civilian models, making it the only version you will need to use in your scenes.
Animations are “in place” and do not use root motion. Check out this stress test running 80 animated characters in a web browser.