Main Characters:
* Mia Thermopolis: The clumsy and awkward teenager who discovers she is the Princess of Genovia.
* Clarisse Renaldi: Mia's grandmother and the Queen of Genovia.
* Joe: Mia's best friend and classmate.
* Lilly Moscovitz: Mia's other best friend who helps her navigate the challenges of being a princess.
* Lord Devereaux: Clarisse's advisor and a close friend.
* Paolo: Mia's tutor and a charming Italian man.
* Lord Nicholas Devereaux: Lord Devereaux's son, Mia's potential love interest.
Supporting Characters:
* Michael Moscovitz: Lilly's father, a supportive and loving man.
* Vicki: Mia's gossipy classmate and rival.
* Lana Thomas: Mia's kind and understanding teacher.
* Lord Ashton: A rival for the throne of Genovia.
* Princess of Denmark: A visiting princess who is competitive with Mia.
* Captain Andrew Harrison: A member of the Royal Guard who is tasked with protecting Mia.
Other Characters:
* Henri: Clarisse's faithful butler.
* Mr. and Mrs. Thermopolis: Mia's parents.
This list isn't exhaustive, but it includes most of the key players in the *Princess Diaries* universe.