As a Director, how Would You Cast and Direct the Roles of Oberon and Titania to Communicate Your Ideas about the Individuals and Their Relationship?

Oberon and Titania are the King and Queen of the fairies respectively. They have fallen out over a 'changeling child'. A 'changeling' being a human baby that has been stolen into the fairy world and a weak fairy child was left in its place (protected from discovery by a fairy glamour spell that would render the image of the original baby over it). Oberon wants the child to become a soldier and Titania wants it to be her prince and rule with her. Their arguments cause changes to the mortal world, such as the weather changing suddenly to thunder storms as a result of their feuding. …