On "Friends", what were the names of the 3 "fictional" characters in Phoebe's book?

In Phoebe's fictional book on "Friends," the three character names are Marsha, Chester, and Phyllis. Phoebe uses these invented names while writing a story inspired by the relationships and disagreements within her circle of friends.

The joke works because the characters are thinly disguised versions of people Phoebe knows. Marsha represents Monica, Chester represents Chandler, and Phyllis is associated with Phoebe herself. Phoebe's writing is intentionally exaggerated and melodramatic, turning ordinary friendship disputes into the plot of a supposedly serious novel.

This storyline fits Phoebe's creative personality. She is a self-taught musician, songwriter, and unusual storyteller who frequently turns everyday experiences into bizarre or theatrical ideas. Viewers sometimes remember only Marsha and Chester because those two names are repeatedly discussed, but Phyllis is the third name in the trio. The names are fictional labels within Phoebe's book, not additional characters in the main cast.