How to make a character susceptible to gravity?

Question

C++ / C#

I'm studying unit3d, version 5.2.2, I made a character, added several animations to it, a character controller, the camera moves behind it, collisions work, but for some reason the character itself does not sink to the surface and does not fall down :-( I'm
interested in how to properly make him gravity so that he touches the stage with his feet and if there are no collisions under his feet, then he would fall down as it happens in most games
.

Answer 1

As I understand it, you have a 2d game. Add a RigidBody2D to the character, and a Collider 2D to the ground.

Answer 2

Ah, I realized that a rigidbody is definitely needed along the way, without it apparently nothing. The first time I had a problem with it, the character fell on its back like a figure :-( but I copied the scripts from the example and everything worked ...