I was thinking you could build a factory or machine shop to produce two kinds of robot NPCs. One would be a bodyguard that would follow you around. You could use hotkeys to change it's mods like making it aggressive or attack who you just attacked. You could upgrade it will better weapons and armor as you get them. To keep it from being OP you could only use one at a time. The other would be androids who walk around your base. You could set them in one room or another. Most of them wouldn't do much outside of saying funny frases. They would more or less be for decoration.