Vaniquette, a sinner that died in the 1980s, is a pyromaniac/arsonist obsessed with bombs and looking amazing while doing turf wars. When her territory gets destroyed by her best friend Angel Dust, his friend Cherri Bomb, and Vaniquette's self-proclaimed greatest rival Sir Pentious, she coerces Charlie and Vaggie into letting her stay at the hotel. While staying there with Angel, she meets Alastor, Husk, and Niffty as the seven work together to run a hotel to rehabilitate sinners.

Lila Rossi (Not Lie-la) is a foreign exchange student from Italy. At a boarding school, she met Chloé Bourgeois and befriended her. After finding out about how Chloé wanted to change, she transfers to her school and lives with her at her father's hotel. She befriends Adrien Agreste, a teen boy who wants to be treated normally as his father is a famous fashion designer and he is the model for it. These two are chosen by an apprentice to the Miraculous to fight evil in the city of Paris when two threats emerge. One of these threats is a mysterious woman named Tyrantula, who uses an evil power to turn people into her puppets. Another threat, one that the city does not know of yet...is Ladybug.