The Zealots were part of the bad guy team in 'Doctor Strange.' They were the evil counterpart to the organization Doctor Strange became a part of, the Masters of the Mystic Arts. I guess you can pretty much tell they are evil by the fact that they're called zealots. I've never once met a good zealot. They're all evil.
The blonde zealot is... blonde. That's about all I can say for her. That and she's got weird eyes, but all the zealots have weird eyes. Once you have your hair color in front of your title, your role may not be the most crucial. In fact, you're probably going to die if it's an action movie. Better a hair color than a negative quality. "Um, director, why is my character called 'hideous zealot'?" / "Oh, because you're hideous."