I personally would really love if it was possible to place NPCs or pets at Housing and would absolutely use it! Maybe there could be a /house command to place the NPC, so that one doesn't need a staff member to place it, similiar to the /house elf and /house shopkeeper commands. I don't know if this is possible, but I would really love it. I think it would be a great decoration for Housing, i.e. I built a terrarium for my serpent pet, so I would put the serpent pet inside.