Thinking about trans Jonah Magnus being a confirmed bachelor in the 1800s and historians poring over the letters from his lovers and records of his life.
Two parents who only had one daughter on record, with said daughter disappearing as a teenager (not uncommon, teen pregnancies usually resulted in girls being sent away to a distant relative or monastery, sometimes returning and sometimes not). A month later, the parents’ nephew coming to live with them, with no records of him before that.
Letters to and from Mordechai Lukas and Jonathan Fanshawe and Barnabas Bennett, filled with subtle (and not so subtle) flirtation and invitations to their estates.
Jonah never marrying, never having children, but almost always being seen in the company of another man.
Jonah starting the Magnus Institute with the support of a wealthy man whom he has a very close relationship with.
The Institute becoming well known as a sort of haven for social rejects, one of the few places that would give real work to anyone regardless of their gender, race, ethnicity, or sexuality. This reputation continuing even well into the 21st century, and it being one of the reasons why the Institute is so looked down on.
I have a lot of thoughts about Jonah Magnus.