Textures are inside the model I've imported a FBX model (made by someone else in Blender), but the textures are inside the model. Recalculating your and reuploading the textures didn't help.





UPD: the model itself https://drive.google.com/open?id=1Btqvb60qj4HtmpKEWG0E-dG--hYd7dR6
You need to enable Backface Culling in the material settings. It is the extra geometry for creating an outline blocking the view.



You can build a custom toon shader. Here is one:



This is for EEVEE only.



If you want you can watch some tutorials on Non-PBR shading. For example https://www.youtube.com/watch?v=E3zHGD8V2IY or https://www.youtube.com/watch?v=dCF29s2FRsQ