Rhaenyra ending up with Daemon
Rhaenyra having ******* children
Alicent turning from princess's best friend and innocent daughter of the HotK to scheming queen
Criston Cole being raised from nothing to KG and Rhaenyra's protector and one off lover to then now mortal enemy
Otto Hightower appearing to be a good and honest HotK but evidently not
Alicent and Otto's relationship continually contorting right to the end
The role of house Velaryon as potential kingmakers, I never knew which way they were going to turn next - including Princess Rhaenys and her unique position
Aemond going from being the picked on unlucky child to most badass of that generation
Most of those weren't twists or turns. It was very obvious from the start/the moment the king seemed sweet on Alicent what was eventually going to happen (in terms of the main story).