Me?
I'd like to see some new Companions with unique uses and abilities.
For instance, a Utility companion with a very large carrying capacity but very limited offence/defence (like a next-gen version of the robot packmule being perfected by MIT as we speak).
Maybe another Utility Companion that can function as a Mobile Crafting Station, but with little to no combat ability and a low carrying capacity.
Possibly a Combat Companion that has no direct attacks at all and reduced carrying capacity, but generates a Defence Screen, mitigating all damage types.
And of course, a Recycling Station crafting station which breaks down everything you place in it with the click of one button.