The Marvelous Mrs. Maisel saw a lot of characters arrive based on real people thanks to its grounding in true showbiz history. Since its beginning, the show includes actual historical figures such as Lenny Bruce and Moms Mabley, but a character like Susie Myerson is only partially based on Sue Mengers. This gave the series a flexible relationship between fact and fiction. The fictional main cast of characters in The Marvelous Mrs. Maisel allows creator Amy Palladino-Sherman the freedom to tell her own story, while the use of real influences gives the show the ring of truth.

https://screenrant.com/every-marvelous-mrs-maisel-character-based-real-person/