Seeing that Mad Dummy is the name for the bro when posessing the dummy, i'll probably start to call mad dummy (ghost form) Nagstablook, and for ruins dum, probably would call them Emptystablook or Blankstablook, since i'm not sure if they had any real name.
You misgendered Mad Dummy as He
Mad Dummy's pronouns are She/They
Babbalbstablook