2D Character Controller

I'm trying to make a play. The closest analogue of the RTS. I have units. I try to make them move and interact with the environment. If I use RB + Collider, the units are pushing each other and enemies in a collision in the melee. Can I somehow disable this interaction? If I make them move with the character controller, the mobs pass through static 2D Collider (walls). Only 3D Collider stop them. Besides using

hit = Physics2D.CircleCastAll (this.transform.position, 10f, new Vector2 (0, 0));

I can not see the other character controller that would make the choice of targets, as well as with the help of

hit = Physics.SphereCastAll (this.transform.position, 10f, new Vector3 (0, 0,0));

What can you do in this situation? Maybe somewhere there is a character controller which normally interacts with 2D Collider?