A respected doctor from a high-ranking family on Matilda, noted for his medical skill and nonconforming gender presentation. His personal and professional relationship with Aster highlights his complex position between two societal classes.

A resident of the lower decks and Aster's close childhood companion, marked by her struggles with trauma and mental dissociation. Her relationship with Aster is a mixture of deep affection and profound pain.

A nurturing figure who raises Aster and Giselle as if they were sisters and serves as a nanny to the upper class. She embodies a matriarchal presence within the lower decks.

An authority figure among the upper decks of Matilda, whose power is exercised through subordinates. His character reflects the oppressive social structures aboard the ship.