IMO I think it is Bloodraven running everything. I'll explain why in a second. I'm speculating that the COTF where kinda of desperate because they knew what was coming and BR took advantage of that. Since he was the last greenseer before Bran they needed him. So he finessed them to protect him and hook him up the the Weirwood Tree so he would help them against the NK/Others.....but he was was really using it to prolong his life and find a way to extract revenge/get a new body
I'm not really a book reader so somebody correct me if I'm wrong....
BloodRaven(BR) was a Legitimized Targ prince that had a could of had a claim to the throne but wasnt well liked....but he was hand to 3 different kings and basically ruled the kingdom behind the scenes like Tywin did... He also had a reputation for killing targ family members that had challenge/claims to the throne (more on that)...At the end he was betrayed by the new king elected in a council (sound familiar) for killing Aenys Blackfire and banished to the wall. The king who arrested him and had him banished was Aegon V, of house Targ whoi Dany and Jon Snow are both descended from....
Now I believe BR would have wanted vengeance, he protected the throne from rebellion for generations and thought he was doing it for the good of the realm, he was playing the game of thrones over 100 years ago
fast forward he lures Bran but he tricked Bran, it was more like Hansel and Gretal to set him up. BR was a skin changer that needed a new body because he was dieing and only alive bc of the tree. But he specifically needed a greenseer to warg into, so he had to wait all this time for someone like Bran with magic abilities to come along so he can use his body
Concerning Bran - We are told many times during the season that Bran is dead, Bran died in that cave... Bran him self says I'm not Bran a bunch of times
So what happened to Bran? BR convinced him to warg into Hodor during the cave attack to save them. The NK kills
BR while he is still warging inside of Bran's mind, while bran is inside present day Hodor holding back the door.....
as Hodor gets stabbed up what music is playing? The stark theme
look at the scene again Hodor wasnt a stark, were they playing that music because Bran was getting killed at that cave stuck inside Hodor?
After that scene Bran is completeley different, BR took over his body and inherited Brans memories but its not Bran anymore it BR in a young strong body that has magic powers already
From here on out BR is just orchestrating his plan to get back to the throne, first order of business.. get rid of Dany & Jon
Dany & Jon are both descended from the King Aegon V who banished him to the wall in the first place, Dany was killed after he used her (Maybe he warged into drogan?thats another discussion) and he sends Jon to the wall which is kind of poetic justice
The Golden Company also points to Bran being BR imo, In the books the founder of the Golden company was BR's brother and lifelong enemy Bittersteel. The Golden Company didnt really have a purpose in the show execpt getting massacred. That could be BR getting rid of his enemies decendants as well...
Sorry for the long post
the 2 biggest arguments for Bran being BR
#1. the council meeting when Bran is elected, this scene really makes no sense other wise...unless you consider Aegon V got elected king in the same exact way at a Kings council meeting before arresting BR, Bran tells Tyrion "Why do you think I came here?" why else would he say that in that setting unless he was really BR. who else could he be, not Bran? The COTF dont care about a throne, it had to be BR in control
#2
After being King the first thing Bran ask at the table is where is the master or whisperers? thats important, when BR was Kings hand he was known for having a huge network of spies, so thats the first thing he would ask for back at Kings Landing. Then he asked about Drogon, his main concern is finiding the dragon he doesnt care about anything else. Its because BR is a targ and Targs want their dragons
Still not convinced
Thats a Raven on her chest not a wolf
#Targset won in reality
The problem is they rushed this show. GRRM wanted at least 10 seasons, so we could have had 1 season of Dany slowing going crazy and another season that focus more on Bran visions or BR but I suppose they would have gave it away if they did that
For TV viewers the 3ER/BR was not done well but maybe thats why they want to focus on the prequels now and we will get a show about BR and the Blackfire rebellion