Niania

Franciszka Zofia Skalska (née Maj, born 23 December 1975) (Agnieszka Dygant) is a 30-year-old nasal-voiced woman, who works for Mr. Maksymilian Skalski as the nanny to his three children: Małgosia, Adaś and Zuzia.[16] She is the daughter of Teresa and Stefan Maj and granddaughter of Apolonia Lipiec. After several years, she married Maks, to whom she gave birth to twins, Maria Magdalena and Franciszek Józef.

Maksymilian Maria Skalski (Tomasz Kot) is a 40-year-old rich TV producer who becomes a workaholic after the death of his wife Anna. He is honest, though sometimes distant and ironic. His feelings for Frania Maj developed, but the man tried to hide it. He is the son of Janusz and Elżbieta Skalski, brother of Joanna (Katarzyna Figura) and Aleks (Rafał Królikowski), and step-brother of Zdenka (Katarzyna Skrzynecka). His grandmother is Matylda Skalska (Barbara Krafftówna).

Małgosia Skalska (Maria Maciejowska) is Maks's oldest child. Initially shy and morbidly insecure, under Frania's influence she turned into a feisty, joyful girl – she started going to parties, dating boys, and making her first serious decisions, which she always shared with Frania. She married photomodel Michał (Zhora Korolyov).

Adaś Maks Skalski (Roger Karwiński) is Maks's son, with whom no nanny could make contact after his mother's death, until Frania Maj came along. He took an interest in girls, loved to mess around and tease his sisters.

Zuzia Skalska (Emilia Stachurska) is Maks's youngest child. She went to therapy because she was closed off and introverted. Thanks to Frania, she gradually opens up. The nanny is a source of maternal warmth for her, which Zuzia really missed after the loss of her mother.

Karolina Łapińska (Tamara Arciuch) is a 30-year-old business partner of Maks. She is elegant and classy, but stiff, pretentious and conceited. She did not like children and tried to hide it. She saw Frania as a rival in attempts to win Maks's affections. She despised Konrad for years, but a year after Maks married Frania, she married the butler and became pregnant with him. She is the daughter of a sailor and sister of Karol (Arkadiusz Brykalski), a doctor at the University of Gdańsk.

Konrad (Adam Ferency) is a butler. His father worked in the British embassy and was also a butler. He himself graduated from Jagiellonian University. An extremely intelligent and witty commentator on family life in the Skalski's house. Although he is Maks's employee, he is often like a father or a friend to him, always offering him advice. At first he is the only one to notice the feelings developing between Frania and Maks, so he makes subtle allusions to them. He is friends with Frania, for years he despised Karolina Łapińska, but a year after his boss married Frania, he married Karolina. In the last episode of the series it was revealed that they are expecting a baby.

• 
  Agnieszka Dygant as Frania Maj
• 
  Tomasz Kot as Maks Skalski
• 
  Tamara Arciuch as Karolina
• 
  Adam Ferency as Konrad
• 
  Elżbieta Jarosik as Teresa Maj

Teresa Kwiryna Maj (née Lipiec) (Elżbieta Jarosik) is Frania's 50-year-old mother. Delighted with Frania's new job, she sees promising prospects. She dreams that Frania will settle down (she mainly sees Maks as her husband) and wants to have grandchildren. In an episode of bank robbery, Teresa talks about her hypoglycaemia, which explains why she eats a hearty meal or thinks about food in almost every scene. She comes from the town of Tłuszcz.

Stefan Maj (Marian Opania) is Teresa's husband and Frania's father. He is on a disability pension. His favourite pastime is watching television.

Apolonia Lipiec (née Bąk, born 1933) (Barbara Wrzesińska/Krystyna Rutkowska-Ulewicz) is Frania's grandmother. She watches over her granddaughter, sometimes excessively. She suffers from dementia. Her fiancé is Czesław (Stanisław Tym), a retired military officer.

Jolka Ząbkowska (Iwona Wszołkówna) is Frania's best friend since school times. She lives with her parents in Praga district, on Ząbkowska Street. Not very intelligent and not very bright, but nice and open. Unsuccessfully searches for a life partner.