How do you stop characters with armatures from falling through the ground

I am in the process of making a game, but I am halted due to the fact the characters fall through the ground!
I tried using emptys, but that didn’t work. I know this is probably a very easy thing to solve, but, I don’t know how to solve it!:o

You can just parent the armature to a large rigidbody cube as a “bounding box” for the character then assign movement logic to the cube, But this won’t provide the most accurate collisions ever.
If you’re interested in accurate ones check the animated ragdoll in my signature.