Rachel Karen Green is a fictional character, one of the six main characters who appeared in the American sitcom Friends. Portrayed by Jennifer Aniston, the character was created by David Crane and Marta Kauffman, and appeared in all of the show's 236 episodes during its decade-long run, from its premiere on September 22, 1994, to its finale on May 6, 2004. Introduced in the show's pilot as a naïve runaway bride who reunites with her childhood best friend Monica Geller and relocates to New York City, Rachel gradually evolves from a spoiled, inexperienced "daddy's girl" into a successful businesswoman. During the show's second season, the character becomes romantically involved with Monica's brother, Ross, with whom she maintains a complicated on-off relationship throughout the series. Together, Ross and Rachel have a daughter, Emma.

Monica E. Geller is a fictional character, one of the six main characters who appears on the American sitcom Friends (1994–2004). Created by David Crane and Marta Kauffman, and portrayed by actress Courteney Cox, Monica appears in all of the show's 236 episodes, from its premiere in 1994, to its finale in 2004. A chef known for her cleanliness, competitiveness and obsessive-compulsive nature, Monica is the younger sister of Ross Geller and best friend of Rachel Green, the latter of whom she invites to live with her after Rachel forsakes her own wedding. The two characters spend several years living together as roommates until Monica begins a romantic relationship with long-time neighbor and friend Chandler Bing, whom she marries. Unable to conceive children on their own, Chandler and Monica eventually adopt twins Erica and Jack and move out of their apartment into a larger house in the suburbs.