His Dark Materials is good, and I must admit you have it right there about Mrs. Coulter.
Really, I'm of the opinion that if you spin it right every single character ever presented in fanfiction or anime or roleplay can be thought of as a sue or anti-sue. Even a villain. He can be considered "perfectly evil" too "dimensional" or anything if the reviewer is creative enough.
Thus, I don't let people accusing me of having my characters be sue-like bother me unless they present concrete evidence.