NPC's? I think you select layer 4, right click and select "New Event" or just press "enter" and the "New Event" box will appear in front of you. Double click on graphics and just select the character you want to have on your map and click okay. (Also note that you can click on the character facing different angels). If you don't know what a Event is then it is used for actions the hero, npc's and enemies do. You can double click on @> (In list of event commands) and then choose between various of things. To begin with double click the @> and select (In 1 (there are 3 lists)) "Show Text..." and write something like:

Sebastian:
"Beautiful day, is it not?"

Think that is the only way.