How to use transform.position.z to decide model render result?

I'm making a 2d platform game which use 3d monsters, when monsters gather together, they just pass through each other. I want to render the monsters just using their transform.position.z, but still need to keep the origin 3d light effect upon the models.

It's a bit hard to describe the question clearly, so just watch the pictures. Just imagine the cube and the capsule as 2 different monsters.
In scene window, it looks like:

In camera, it looks like this:

the Cube's transform.position.z is in front of the capsule. Is it possible to render like the picture below?
I know it's possible to make it with 2 cameras, but there might be a lot of monsters. It's impossible to create a lot of cameras.


Anyone has some advice? Thank you!

 

you may be able to modify the render order with https://docs.unity3d.com/ScriptReference/Material-renderQueue.html

also of note, if you are using directional lighting, and an ortho camera, you should be able to move your entities forward and backwards without affecting the lightning or rendering , and avoid this problem wntirely (if you have point lights this wont work)

 

Thank you for your reply!

I remember that render order only affects the order when rendering but does not affect z-write? I tried setting the render order in render queue manually, but 3d objects with different render order still pass through each other.
Maybe I did something wrong? Could you show me an example which works as the 3rd picture I post?

I'm using an perspective camera though, and point lights are necessary for some effects...

I guess a perfect solution for me is a shader which normally calculate the lighting, and then show gameobjects ordered by transform.position.z...However I'm not sure if it's possible.