Teenage tearaway Mandy garnered a reputation as one of the BBC soap's most hated characters during her original stint on the show between 1992 and 1994.
Speaking ahead of her return to Eastenders on Monday, Stapleton said that although Mandy is older, she has not grown out of her desire to "shake things up".
"She dresses very skimpily and uses her body to get what she wants," the 37-year-old told The Sun. "She's very minxy and incredibly flirty. I'll be here at least until some time next year, so I've got plenty of time to shake things up."
Stapleton explained that she agreed to return to Eastenders during filming of the show's live 25th anniversary special in February 2010, when executive producer Bryan Kirkwood left her "buzzing" with excitement over proposed plots for Mandy - including one that sees her start an affair with a young Walford resident.
"It had been discussed before but as soon as Bryan Kirkwood started telling me all these storylines he wanted to do with Mandy, I was buzzing," she recalled. "She does toy with one of the younger boys."
> 'Eastenders' Nicola Stapleton: 'I'm thrilled with return to soap' Get the Inside Soap magazine on your iPhone or iPad