This is a paid asset, but now you can download Simple Pedestrian System Free.
Detail this asset from Unity Store: Original Link
Simple Pedestrian System v1.0
SPS (Simple Pedestrian System) is optimized solution to implement a pedestrian system to your city or any game scene. You can add any model in place of pedestrian. If it is an open world game and you want the pedestrians to populate near your player (activate and deactivate near your player) then use our spawner model. If you randomly want pedestrians throughout the waypoint system then use our auto model (It will populate pedestrians on random waypoints with time).
Well written documentation is placed inside the package.
This package contains
Simple way point system (Time Based)
Simple way point system (Spawner Based)
Multiple movement pedestrians option
Gizmo Scripts
Ethan Default model
Default Humanoid Walk and Run
Animations