Created by David Law, Denise was the cousin of Dennis the Menace, who came to stay with the family for a time in Autumn 1967. Denise (who seldom seemed to speak) was virtually identical to Dennis but with a skirt and a bow in her hair. She bears some resemblance to Beryl the Peril, another character drawn by Law in the Topper comic.
She later appeared in a Dennis strip in the late 70's, where she had a different hairstyle (Very close to Beryl's hair style) but still wore a striped jersey like Dennis. This strip was reprinted in the 1992 Dennis the Menace annual and was called "Driving Dad Daft".