Madison "Maddie" Rooney is one of the two titular protagonists from the Disney Channel original series Liv and Maddie, along with her identical twin sister and best friend Liv Rooney. She's the tomboy compared to her sister, but there are times where she reveals her girly side. Maddie and Liv are very close and tell each other everything. They are not complete without each other and rely on each other for everything. Aside from Liv, Maddie has two brothers Joey and Parker and parents Karen and Pete Rooney who work at the school that they attend. Maddie, whose popularity as an outstanding student in school and talented basketball player, finds out that things may take an unexpected turn when her Hollywood star sister, Liv, makes a triumphant return to their Wisconsin High School. Despite the fact that her sister is a star, Liv learns to respect Maddie for who she is. As of now, Maddie seems to be confident in herself, not letting her sister's fame get to her. And finding her own path in life, following her dream as a Basketball player.

Maddie as well as Liv are both portrayed by Dove Cameron. In scenes where Dove is portraying Liv, Maddie is portrayed by body double Shelby Wulfert.