She even announces this to the readers at the start of the album "De Nerveuze Nerviërs" ("The Nervous Nervii") (1964).

Willy Vandersteen created her because, according to him, "a real mother would never allow her children to go on adventure like Suske and Wiske do".

In "De Poenschepper" ("The Money Shoveler") (1963) it is revealed that she built a secret shrine for Lambik, who has been missing for several months.

In several stories she comes up with ingenious plans to solve complicated problems and uses her slender body to good use.

In some stories she has to be calmed down with a mustard foot bath, smelling salts or a quick hospital visit.

In "De Zwarte Zwaan" ("The Black Swan") (1958) she is a guide during the Brussels World's Fair in 1958.

[3] In "De Tijdbobijn" ("The Time Bobbin") (2009) he moves in the castle of the Van Zwollem family.

Sidonia's niece, Carmencita Falasol, is a Spanish operasinger who is married with inventor Don José del Rondello, with whom she has a toddler son, Sprotje.

In "De Koning Drinkt" ("The King Drinks") (1947) we learn that a medieval woman who shares a physical resemblance to her was a royal warrant holder.

[5][6] In the 1975-1976 Dutch TV puppet series Suske en Wiske Sidonia's voice was done by Trudy Libosan.

In the 2004 live-action film "Luke and Lucy: The Texas Rangers" she was voiced by Sien Eggers.

[9] In the Dutch educational comic strip series Van Nul tot Nu (1982), which tells the history of the Netherlands in comic book form, Alonso Pérez de Guzmán, 7th Duke of Medina Sidonia is caricatured as Tante Sidonia as a nod to Suske en Wiske.