They are a group of heroes based in Tarabiscoville, known for playing acrobats together in the rooftops of the city, going on endless adventures and stopping villains in the night.
Les Pyjamasques consist of:
Yoyo (Sacha): A kid in a cat-costume with super-speed and great jumping abilities. He drives the Chat-Bolide. His suit is cyan and has ears and a tail.
Bibou (Amaya): A girl in a owl-costume with flying abilities and a special ability to shoot feathers from the owl wings. She is only female member of the group and flies the Astro-Bibou. Her suit is red and has an owl mask with feathered wings on her back.
Gluglu (Greg): A boy in a lizard-costume with the ability to stick at walls and ceilings, and the ability to camouflage.
It is noticed that the Pyjamasques are not interested on being invisible to the public and they tend to reveal their true identities and personal details (apart from Le totem des Pyjamasques for their animal totems, as seen in these books:
Les Pyjamasques et l'opération zéro: While fighting Roméo Mécano, the Pyjamasques gave away information on what school they attend when they declared that they are preventing Roméo Mécano from destroying school, therefore they are revealing their true identities which allowed Roméo Mécano to know who they're really are.
Like the PJ Masks, the Pyjamasques never worked during the daytime.
Unlike the PJ Masks, the Pyjamasques will not need to use bracelets to turn into their superhero alter-egos:
Yoyo, Bibou and Gluglu will need to have their animal totems to turn into their superhero alter-egos.
Unlike the PJ Masks, the Pyjamasques are not interested with hierarchy of the group at all.
According to the Zouzous website, Les Pyjamasques are all 7 years old. Therefore, they are older than the PJ Masks.