The Meaning of Life, the Universe, and Everything.
Some where you're not.
I love the idea of there being a very rare chance of encountering the removed Human mob doing as you described; however, feature wise they don't serve much of a purpose. That and there's a few problems with implementing something like this.
1. They could end up competing against the player assuming the Human mob actually goes out and collects resources.
2. If the Human can come under attack by mobs and it dies that's that, new friend is gone forever.
3. Can it respawn?
4. How would it handle perceived aggression by the real player?
My only recommendation is to keep looking for a decent server, but the ones that you're searching for a very hard to come by unless you know someone who's already in one.