>>212429489Without spoiling anything, just talking about what has already happened in the show, they completely butchered the characters and their motivations.
Greens:
Alicent is religious and less of a hypocrite in the book. Her motivation is her kids.
Show Alicent meeting with Rhaenyra and that whole peace offer bullshit never happened.
She is also less of a victim as she is portrayed on the show, and has more agency.
Aegon is not some drunkard kid that likes to father bastards everywhere and see them on the fighting pits. He actually cares about his brothers and sister-wife which is why he accepts the title of King reluctantly. He only gets into drinking heavily after his injuries.
Aemond is still a sociopath tho.
Blacks:
A lot of the evil shit that gets pinned on Daemon is actually at Rhaenyra's instigation.
Rhaenyra is much more irresponsible and reckless in the book. You can tell she has zero idea of what ruling entails, she is more of a spoiled kid that Aegon.
Rhaenys never has the YASSS QUEEN moment at the coronation, which was an extremely stupid addition.
The Velaryons are way less enthused about some bastard taking their seat, Rhaenyra kills a lot of Velaryon heirs to keep them in line.
A lot of great characters have been omitted.
Basically the show goes to great lenghts to whitewash Rhaenyra and turn her into the hero, when the book is more nuanced. There is no "good guys" vs "bad guys", the point is that the civil war was destructive and idiotic and destroyed the Targ's standing and power, even though their dynasty limped on for some centuries more.