It’s funny, I actually see this a little differently than a lot of guides out there. They always say to tie your OC directly to a Great House or a major event like Robert’s Rebellion. But sometimes the most interesting stories come from the margins. I made a trader’s daughter from Braavos who ended up in King’s Landing because her father’s ship sank. She’s not nobility, has no secret lineage, and her biggest conflict is just trying to survive and maybe get a position as a scribe. The politics of Westeros are this massive, terrifying machine she doesn’t understand. It lets me explore how the smallfolk actually experience the wars and schemes from the ground level. Her backstory is full of mundane details—debt, a failed apprenticeship, a mother who died of fever—that feel more real to me than another hidden Targaryen.
What sells it, I think, is giving her a very specific, practical skill set. She’s good with numbers and languages, which is useful but not flashy. It creates organic ways for her to interact with the world. Maybe a minor lord needs his books looked at, or she overhears something in a foreign tongue. The constraints force more creativity than starting with a blank check of royal blood. My advice is to pick a trade, a craft, or a very limited social position and build outwards from the daily frustrations. The 'compelling' part comes from their humanity, not their pedigree.