Cersei Lannister
The daughter of an incredibly powerful house, she and her children are destined for great things. Or Else.
Where is she from?
Cersei is one of the point-of-view characters in the hugely popular series of fantasy novels A Song of Ice and Fire. She's as close to a singular antagonist as the series has, ony starting to have her own point-of-view chapters by the fourth book. Up until then she is about as full-on evil as anyone, but once we start to see things from her point of view... well... she's still pretty evil, but at least she becomes sympathetic. She's played in GoT by one of the most criminally underused actresses in Hollywood, Lena Headey.