“To me, the most rewarding improvising is having agreed on an idea beforehand, where the scene might go, who your character is, or what might possibly be funny about your character, and at the same time be completely open to the other people because you’re not alone,” O’Hara said.
In his book Improv Nation, Sam Wasson calls her “one of the most fluid improvisers of her generation. Others may be crazier; none were as elegantly at ease.”
This is a great article on her
https://www.theguardian.com/film/2026/feb/01/catherine-o-hara-obituary