These two characters in The Luring (played by Al Marz and Chelsea Reed Davis) may be small but they both make a huge impact on the movie. I think when you write supporting roles like these it’s important to keep in mind how they help move the story in a compelling way? When a new supporting role enters the screen they don’t have the benefit of staying around long enough for the audience to really get to know. So make their interactions with the other characters or whatever situation they’re in be a little bit extra and offer new information to keep the story flowing in a entertaining direction.
Writing these characters is a lot of fun because of the high impact they get to exhibit so think out of the box when introducing them, have fun. Make them be someone an actor can really enjoy playing. Make the situation or interaction their characters are in bring a new meaning to the scene and the rest of your film will benefit greatly from it.