Here's a breakdown of the main "A"s:
* Original A: Alison DiLaurentis is revealed to be the original "A" in the first few seasons. She was the girls' former friend who faked her death and then tormented them from the shadows.
* "A" Team: In later seasons, the identity of "A" shifts to a team of people, including:
* Charles DiLaurentis: Revealed to be Charlotte DiLaurentis, Alison's brother who later transitioned to female, Charles was the main antagonist in the show's early seasons.
* Mona Vanderwaal: Originally a friend of the Liars, Mona becomes the first person to officially take on the "A" persona. She's driven by a desire for revenge and a need to control the girls.
* "A" Team Followers: Mona recruits a group of followers to help her in her quest to torment the Liars, including CeCe Drake (Charlotte DiLaurentis) and Bethany Young (the girl buried in Alison's grave).
It's important to remember that "A" evolves throughout the series, becoming a more complex and multi-layered villain. The constant shift in identities and motivations is what makes the show so compelling and keeps viewers guessing until the very end.