Both are pretty easy to do. For the narrative, you set the screen tone to all 0 (last value doesn't matter.) Then go to the message window options (under the text box command) and set it to transparent. When you finish the narrative, make the text box opaque again.
If you want to make your sprite dissapear, go to "Set hero walk GFX" and set the head character's sprite to a blank sprite (there's bound to be one file with that, if not make your own) When it's done, just go back in and return it to the original sprite.
