1. Some backstory on the Garon's, Sumeragi's, and the unknown knight's journey to the Sevenfold Sanctuary
2. Maybe some information on the kids that died during the Concubine Wars?
3. More dark tomes (even simple things like Flux, Ruin)
4. Female Grandmaster when
5. I think it would be really cool to include enemy-only weapons from past games. Like Naglfar, Alondite, Loptyr, Eckesachs. Hell, Expiration would be incredible (all these would need to be nerfed like hell though)
6. I would kill a man for a Queen Ekaterina story. Or voice. Or even a portrait I'm desperate over here