In "Isla and the Happy Ever After," Stephanie Perkins explores the lives of three friends whose personalities and dynamics evoke those of Harry, Ron, and Hermione from the Harry Potter series. Their interactions and relationships mirror the chemistry and loyalty seen among the beloved trio, making their friendship feel familiar and authentic.

These characters' similarities to the famous trio are uncanny, highlighting themes of friendship, bravery, and personal growth. The story emphasizes how close bonds can influence and support individuals through life's challenges, much like the reassuring presence of Harry, Ron, and Hermione in their adventures.