GLINDA, the Widow of Oz
In the Wicked two-part film adaptation, Glinda Upland (portrayed by Ariana Grande) serves as the co-protagonist and deuteragonist alongside Elphaba. Her character undergoes a dramatic evolution across the two movies, transforming from a shallow, popularity-obsessed schoolgirl into a powerful, politically savvy, yet isolated leader. [1, 2, 3]

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Galinda (later Glinda) is the bubbly, status-obsessed rich girl who becomes Elphaba's unlikely best friend.
Act One / Part One
Act Two / Part Two
Are you asking about the stage musical or the film? The details differ slightly, and I can go deeper on either.
In the movie "Wicked," Glinda Arduenna Upland, also known as Glinda the Good (formerly Galinda), is the deuteragonist. She is portrayed as a complex character who starts off as somewhat superficial and popular but grows into a kind and caring person. Glinda's role involves her evolving friendship with Elphaba (the Wicked Witch of the West), navigating social dynamics at Shiz University, and ultimately playing a key part in the story's exploration of good versus evil in the land of Oz. The character is iconic for her charm, wit, and transformation throughout the story.
In the 2024 film adaptation, Glinda is played by Cynthia Erivo, with Ariana Grande playing Elphaba.