Transmigrating to the 19th Century, I Became a European Noblewoman

Looking for Marvel, DC, or DC/Marvel Crossover Novels

Ideally, something involving a chat group, chat room, forum, or characters watching a movie about themselves.

British Style, Medieval Aristocracy

Any Novels About Western Aristocrats, Preferably Set in Europe?

For example, otome novels with a Western literary style

Looking for Stories Set in 19th-Century Europe or America, Whether the Protagonist Transmigrates or Is Reborn

Set Entirely in the European Royal Courts, with a High-Ranking Female Lead

After reading some comics, I got interested in European royal-court settings. Anything with a European royal background works!!!!