Get ghost on first level:
When you go into the first house you will find a ghost near the back of the house on the first floor. get cogjammerand and put him on the radio on the shelf over the vacuum then use the move at the top of his list and the ghost will now be yours to use.
How to get hidden character:
To get banzi go to unusual suspects and bind stone wall to the plant in the main lobby and use tremor.