Concept artist Claire Hummel was responsible for designing the Luteces. She was given minimal information about the characters, but otherwise had free rein to develop their visual design. The creative parameter set for Hummel was that they were a pair of "twins" in terms of their relationship dynamic, and that they were elegant and ethereal by nature. In her view, it is impractical to create the variety and cultural context of a given time period without being thoroughly familiar with the time period through its reference material. The Lutece twins ended up with more stylish and contemporary clothing compared to the rest of the cast, which is reflected by their true nature as time travelers. Hummel decided that the Luteces would have red hair, and that Rosalind in particular would wear a dress. The physical appearance of both characters reflected the commercial beauty ideal of their contemporary time period: Rosalind's hairstyle is inspired by the “ Gibson Girl ” look, and Robert's overall appearance evoke " The Arrow Collar Man ” archetype. Robert was originally drawn with facial hair early in development, which was removed by the time the character's design is finalized. In terms of background lore, both characters were briefly described in the instructions Hummel received as the game setting's equivalent of Nikola Tesla.