Hmm, I'll try to remember what exactly I did so I can detail it. Basically I opened an overworld to edit, a house at the beginning of the game north of the hero's house. I would go inside that house and open the overworld in the npce. After that I would ADD a new npc and set the coordinates of where i wanted a character to appear, (say...x 1 y 1) and basically clone one of the characters in the room, using their script, facing, and everything but their ID number. I would set a new ID number, 3 in this case since this was the 3rd npc in the room. After that I would reinsert the narc, save outside the house. Reset the rom and enter the house. Each time I enter the house, the game would crash.