I have a few different ideas. Most all involve Robb and an OC. I would really love to find someone who would play Robb.
The northern army has been at war with the south for months now in a fight to win their independence as well as for the Starks to get their beloved sisters and daughters back. Each and every battle the Lannisters have said to have been defeated. What would happen if the King in the North gained another advantage when they would take over a stronghold and come across a Lannister. Not only that but a female? Will they use her as a bargaining chip since the Kingslayer is much to dangerous to let free, or will other things occur?
When Lady Catelyn and her son Robb made a deal with the Frey's, most of the men joined the northern army in the march south for war. In this I'm thinking one female, a granddaughter of Lord Frey, would sneakily go to join them. Perhaps tired of being at The Twins where there was to much family around to ever really stand out in the crowd. Perhaps passing off as a commoner or bastard and helping with the wounded, what would happen if she and the king caught each others fancy? Better yet, what if he had no clue she was a Frey? Would he be considered going back on his word by wanting a granddaughter instead of a daughter?
In an attempt to make peace with the Starks; Tyrion and Cercei arrange to have one of their cousins be betrothed to Robb. Unknown to Robb, or even the Imp, Queen Cercei plans to have the cousin marrry him, birth an heir for Winterfell, maybe more than one kid because bad things happen sometimes, and then have him killed that way the child will grow up in Lannister influences and they will have yet another place that the lions rule.
In this idea Margaery and Renly would have consummated their marriage before his death. But the thought was, after his death thanks to Stannis, Loras wants revenge and the Tyrell's need a new alliance. With the northern army winning they decide to try and forge one with the Starks using the next eldest girl in the line after Margaery. Whether we leave it that Robb made his oath to the Freys or not doesn't bother me. (Could just add a bit of drama into it all if we left it like that.
I'm thinking either doing something with the idea above or keep things how they went in the series and have an oc somehow captured by the army.
This would be an OC x OC sort of idea. I'm thinking darker themes, NC/hostage
So it's a vague thought but I'm thinking to have it set in during the times when the Starks were the Kings Of Winter. (I'm not sure how far in the past it was when they were.) But basically my thought was my character would be a noblewoman from one of the southern kingdoms houses, an enemy to the Starks, and somehow she ends up captured and in their possession. Being that she's very pretty the Stark king, or perhaps a prince if they have siblings, a.k.a your character, would decide to take possession over me and use me for your pleasure.
We can discuss things more in detail and flesh the thought out.
Okay so this one was sort of inspired by the song The Scientist by Coldplay. Like some of the others it does have to do with a Lannister and also becoming captive. But in this one I was thinking the way her and Robb meet was during the point when everyone was at Winterfell back in the very beginning of the series. And for one reason or another she decides to sneakily stay after the Lannisters and Ned, Arya, and Sansa head back south.
I left it vague so it could be fleshed out a bit. Basically my thought was the drama and tension that would come once all of the shit hits the fan in the south and the north goes to war with them. Especially if they kind of like each other by the point she would have to be considered a hostage.
Princess Argella Durrendon was the daughter of Argilac Durrendon, the last Storm King. After her father was slain by Orys Baratheon in a battle that would be called "the Last Storm", Argella locked herself inside Storm's End declared herself Storm Queen. However, her garrison refused to share the fate of King Argilac and revolted, delivering her to Orys naked and chained. Orys, however, removed the chains and gave her his cloak as well as food and wine. She was later married to Orys to cement the latter's rule over the Stormlands.
This happened during the Targaryen conquest. I was thinking maybe to do something similar to this or just come up with an idea based off of it. Maybe take two major houses and use ocs, or a major house and a minor noble house. They could be sworn to the major one, or sworn to their enemy or something.