I want to collisionbetween planes

I want to collision check with planes.
Let me describe this image.
There is two characters made of plane.

If I move one character to the other and they have collision, I want to check this situation.

I want to make 2D game with only plane.
of course, using orthographic camera.

I’m noob, so I try to learn Unity3d with site. but it so hard to find the answer. T.T;

Plz help me guys.

821-none.png

Just use box colliders. Just because the camera is orthographic, doesn’t mean the entire game runs in 2D- in fact, your game will always be 3d in some respects if you are using the Unity engine.