>>718231230
To answer as the one that took that pic>>718231239
Basically generic NPCs are outsourced to jeets to create a shitton of basic models. The visual difference was more obvious in Part 1, because they looked way too "normal" compared to the anime-style Roberto Ferrari designs of the main cast.
The Jeets that did the NPCs for Rebirth stylized them a bit more, so it's closer to the faux-real-anime style (larger eyes mainly), but they're not exactly like the main cast still.
Also that screenshot I took was turn when the NPC was talking and it was funny moment on what her face stopped on.