Friends went from strength to strength across its 10 seasons on NBC, creating a strong fan base that continues to grow today. The series followed the six titular friends -- Ross, Rachel, Monica, Chandler, Phoebe and Joey -- through their daily lives in New York. But it wasn't just those characters who made the show memorable; other characters filled out their world, too.
Source：https://www.cbr.com/10-best-character-arcs-in-friends/
