I think the protagonist is really interesting. They usually drive the story forward with their unique perspective on magic. There's also that one side character who has a strange and powerful magical ability that makes them stand out.
The most interesting characters include the rebel magician. This character challenges the traditional magic system and tries to bring about a revolution. Their ideas and actions are very thought - provoking. Then there's the young prodigy who has an innate talent for magic that is far beyond their years. Their journey of exploring their power and its limits is quite captivating. And there's also the mysterious figure who appears from time to time, leaving hints and clues about the deeper secrets of the magical world, which makes the readers keep guessing about their true identity and purpose.