Sort of, but I don't see how it would work out well.

Pretty much, we have one toon which leads.
The other toons have some form of follow.

If they are in separate places or servers.
We can push forward on the keyboard, and have all the toons move forward.
But you might need to turn left on one, and right on another.
You can move your mouse to the active window or PiP swam to micro manage one at a time.
But that isnt' too efficient or quick.

Similarly, spells or abilities are set up.
So the main does something, and the alts/slaves do the same or something different, but on the same keybind.
They usually assist the active window.
But if the active window is on another server or in a different instance.
Well that's not going to work too well.