Spencer's biggest rival is her older sister, Melissa, and the two are constantly fighting over something.
Their relationship is often strained by the fact that Spencer has a habit of crushing on Melissa's boyfriends (first Ian, then Wren).
Aria was dating Noel, however, she kissed Ezra while meeting each other to talk. However, she was in love with Ezra and stayed with him.
Aria found out that Ezra is writing a book about Alison and used her in order to uncover the mystery of who tried to kill Alison. She then breaks up with him, and he resigns from the school as a teacher.
Charming and manipulative, Alison was skilled at finding ways to blackmail everyone, and many people hated her.