Tanner and Marie have a malewife and girlboss dynamic. Platonically, since they're siblings.
Marie is entirely black, with long silky black hair. To mirror her brother, she wears black pants, a black suit with four white buttons and a more formal design compared to Tanner, a white tongue, and a white shirt along with a black bowtie.
Tanner and Marie both died around the 1900s, explaining their affiliation with classic music and their black and white designs.