Robert Baratheon
For someone who was only on the program for the first season (and only seven episodes), Mark Addy in the part of King Robert Baratheon left an indelible impression. His character also left quite a shambles after he died. As in the show, Robert is characterized as a fine and noble warrior in his youth, but has since turned fat and irresponsible as a result of power. However, in the book, he is only in his mid-30s when he dies.
Rhaenyra Targaryen
We got to see more of Westeros than we expected after Game of Thrones concluded, thanks to House of the Dragon. House of the Dragon, on the other hand, is based on only a few chapters in Fire and Blood, as opposed to Game of Thrones, which was based on five books. This means that we have far fewer character descriptions. Even with AI, we can see certain distinctions between actors and characters. In the case of Rhaenyra, both Emma D’Arcy and Milly Alcock share the characteristic white hair and sharp eyes.