Universe (Return of the Puritan Streaker)
One universe was home to a French Jenny Everywhere who called herself Jeanne Partout. She was active within a wider community of French superheroes and supervillains, many of whom were “animal-themed”, including a “cute Parisian boy in [a] tight black leather superhero costume”. A resident of this universe, known as Madame DC, was also known for writing real-person fanfic about the various heroes and villains.
At some point prior to April Fools' Day 2023, the Puritan Streaker popped up in this dimension, teaming up with local minor villains La Frotteuse and Yaoi Boy. Because Jeanne was busy in Paris, she asked the Parallax Universe's Jenny Everywhere, who was more than happy to have an excuse to visit Nice, to fill in. Kim declined to come along, as she had shopping to do, but suggested that she had visited the Promenade des Anglais before in another universe, and would be happy to visit it again in Jenny's company sometimes. In the end, Jenny was unable to defeat the trio of exhibitionist villains because she had been unaware of Yaoi Boy's presence, allowing him to ambush her; stripped naked and tied up with magical Japanese knotweed, she ended up having to shift back home to get Kim to untie her. (PROSE: Return of the Puritan Streaker)
Behind the scenes
The “animal-themed superheroes” are strongly hinted to be the cast of Miraculous: Tales of Ladybug & Cat Noir, although it is not clear that this universe is the canonical Miraculous universe as opposed to a counterpart or analogue thereof. The “cute Parisian boy” is transparently Cat Noir; Sanford noted in the author's notes that the idea regarding Madame DC was that Jenny wrongfully attributed the fanfics to the protagonist's mother Sabine Dupain-Cheng when they are in fact much more probably written by Sabine's mother-in-law, Gina Dupain.