Lydia Bennet as Frodo Baggins in the Lord of the Rings*
How does Lydia Bennet change the Lord of the Rings if she takes Frodo Baggins’ place?

A Christmas Carol ~ Darcy and Elizabeth Bennet as Scrooge
A Christmas Carol remains the same whether Darcy or Elizabeth Bennet takes Ebenezer Scrooge’s place

Persuasion ~ Elizabeth Bennet as Anne Elliot
Persuasion becomes a completely different story with Elizabeth Bennet in Anne Eliot’s place.