Rachel

Rachel is Lee's love interest. They become close after Rachel kisses a blind folded Lee at the kissing booth.

Lee Flynn
Rachel and Lee's relationship started at the kissing booth they fall in love immediately. They went to prom along with Elle. In the Kissing Booth 2 their romantic relationship becomes very difficult with Lee spending more time with Elle than her. Lee tries to wrap their relationship and they had a short break but when they reunited at the kissing booth they got back together. In the Kissing Booth 3 Rachel and Lee are trying to manage their schedule together in college and make the most of it with their long distance relationship Rachel will be attending at Rhode Island School of Design (RISD) while Lee will be at University of California, Berkeley (UC Berkeley). During summertime they had fun but before they leave for college Rachel decides to break up with Lee because she did not want to face the same thing that Noah and Elle did. After six years they reunited again and they both got engaged together.

Elle Evans
Elle Evans and Rachel are best friends. Both of them are in good terms. However in The Kissing Booth 2 Rachel and Elle's friendship begins to crumble due to Lee spending more time with Elle. In the school's Halloween party Rachel couldn't handle her temper. In the end they reconciled afterwards. In The Kissing Booth 3 they become the best of friends

Personality
She has a really warm personality in The first Kissing Booth. In the second Kissing Booth, Rachel makes Lee chose between her and Elle because recently he had been spending a lot of time with Elle. He had blown off dates and had been bringing Elle onto all of their dates. Lee later tells Rachel that he loves her, and Rachel replies saying that she loves him too.