Useful stage characters must be articulate, simplified and exaggerated. Select the important details of each character and present them clearly. When naming your characters avoid obvious descriptive names but be sure the name fits the personality. Avoid using names of famous people unless you have a specific reason for doing it. Develop characters that are in strong contrast to each other.
Dramatic tension is based on a balanced conflict between two strongly opposite forces.
Make your conflict clear by sharply contrasting your characters.