Overall, the most interesting characters in the show are:

Daemon, King V from S1, and Young R are the best actors. Queen R (despite some dodgy dialogue), Aegon, Aemond are good too. These characters match the original GOT and are well casted.

In second place: Otto Hightower. The actor for him is very good but the character itself is rather average. Helaena is good, so is Alys the Witch. The rest of the cast are kind of forgettable and some even feel like the 'temu' version of GOT characters.

My least favorite characters are Ormund and Cole. They are boring/annoying and have such punchable faces.