Cersei Weds Euron
We know that Theon and Yara have teamed up with Dany, which means Dany no longer needs Euron’s ships. Therefore Euron will go to Westeros and offer them to Cersei to help her defeat Dany’s fleet.
The fate of Yara
So far, it has been confirmed through pictures of the making of season 7 that Yara and Theon suffer defeat by Euron and Yara gets taken as his prisoner to the red keep. I think Yara will thus die at Cersei/ Euron’s hands.
Euron
Euron will be murdered after he is used by Cersei because she knows he is after the throne and she can’t give that up, not to him anyway.
Theon’s Birthright
Theon is the last surviving son of the Greyjoys therefore his claim to the iron islands is more authentic than Yara’s. Theon will be handed over this birthright when Yara is defeated by Euron (although Euron seems like the person who has the hold of iron islands, he will ultimately die because his character building is weaker than Theon’s. Plus Theon already has 1. Suffered tremendously at the hands of Ramsay, and 2. Theon’s character wasn’t completely smeared by making sure he didn’t actually kill the stark boys. Therefore he needs his deserved good-ending)
The Last of the Lannisters
When Dany and Tyrion reach Westeros, Cersei will attempt to murder Tyrion but will be killed by him instead. (Tyrion will not kill her intentionally because he doesn’t hate her and they need to keep Tyrion’s image clean so they will have her killed as a consequence of her own misdeeds that were intended to result in Tyrion’s death). So Tyrion survives but he “accidentally” kills Cersei, hence completing the prophecy that Cersei will be killed by her younger brother.
Jamie Survives
When Dany takes control of Westeros, Tyrion will not let her kill his brother who helped save his life. Therefore he convinces her to either, 1) Exile him and send him off to Casterly Rock, or 2) Keep him by her side as part of the Queen’s Guard. Jamie however will despise Tyrion for killing Cersei, the love of his life, and his father. His misery is much more severe than his gratefulness for being alive, infact he doesn’t feel grateful at all, he only wants to avenge Cersei/Tywin’s deaths. Therefore this can lead to further plot points in which he will try to make attempts of killing Tyrion even though at this point in time, Tyrion has helped him survive Dany.
Samwell Tarly
Sam has gone to the Citadel and we know that he has a Valyrian steel sword, plus he has used dragon glass before when he killed a whitewalker. Sam will use these things/experiences to try to reinvent the method for forging Valyrian steel swords (reinvent because the existence of these swords tell us that someone already has invented the method before). This will probably involve either dragon fire (if this is true, I don’t know how he is going to use Dany’s dragons to start a Valyrian steel manufacturing factory), or wild fire. And since he is supposedly learning new stuff at the mega library, he will probably also learn how to make wildfire. We have already seen maesters making wildfire for Cersei/Tyrion before. Wildfire itself will help against the whitewalkers, the other two arsenals in the war against whitewalkers will be Valyrian steel swords and of course, dragons.
Dany
I have a feeling that Dany is ultimately going to die. Maybe the Kingslayer will kill her like he killed her father. Jon will carry on the Targaryen blood line and we will find out that he is also a dragon (like Dany is).
Jon Targaryen
He will convince the 7 kingdoms to wage war against the whitewalkers and he will get the throne but will instead give independence to whoever demands it, thereby segmenting the 7 kingdoms.
Sansa and Arya
Sansa dies, Ayra…i don’t know, there is a very good chance that she survives and carries on the Stark blood-line / gives birth to another Brandon Stark. The reason for this is that they’ve shown Sansa as the likely person who will give birth to a stark but since it can’t be that obvious, they will use Arya for this purpose. It is true however that neither girls can give birth to a kid with last name stark. So maybe Arya will have children but she won’t be the one carrying the stark name forward. Which brings me to Bran.
Bran and Meera
Bran will have kids with Meera Reed and he will not only carry the Stark name forward, his generations will also produce at least one more Brandon because almost every generation of Starks has a Brandon, the Builder.
Uncle Benji, the three-eyed raven?
Benji can be used as a name for Brandon. It is very much possible that he was the Bran of his generation for a number of reasons, he helped Bran north of the wall, he survived himself north of the wall (maybe he is a warg and his horse is his go-to animal), he survived the white walkers, he left Bran near a Godswood tree. Needless to say, he will make another appearance in Bran’s life or even his visions. If all else fails, there is just this air of mystery around this uncle Benji character and he has made a number of appearances, plus proved very helpful for Jon and Bran. So he definitely has a big role to play in the upcoming seasons.
Wait – I just found out they already had a Bandon Stark, he was Ned and Benjen’s older brother.
Characters with unknown plot paths
We know that there are some characters who haven’t reached their full potential in the story just yet but they will and we don’t know how. These are,
Varys
Gendry Waters
The Hound (he’ll probably be the one who kills The Mountain)
Olenna Tyrell
Benjen Stark
Robert Arryn
Fiona's Ramblings 