Did You Know?
I love evil characters too, in drama school I've played a few evil characters, and they are SO much fun. You just get to be horrible all day! It's like letting out every little thing inside you you've ever kept in, and all of a sudden you're just like "A HATE YOU ALL!" - So Cersei! Cersei, basically.
Aimee Richardson was not originally intended to be permanently cast as Myrcella: no casting decision had been made yet, and she was simply a stand-in for the auditions involving other cast members, such as Cersei and Jaime. However, the TV series creators discovered that they enjoyed Richardson's strong acting ability for her age, so they decided to officially cast her as Myrcella.