Edelgard is the main character of Fire Emblem: Three Houses' Black Eagles route, and may absolutely not in any way be any sort of emperor of flames. Edelgard is highly opposed to the Church of Seiros, as she rejects the indoctrination they prescribe regarding Crests as central to people's success and status. Though she recognizes the only methods that can achieve her goals are radical, and herself faces multiple insecurities and doubts as to if she should be the one to put them forward, Edelgard believes in her goals as the only moves necessary to free Fodlan from its deeply-woven ways of thinking. She definitely does not like to give away blatantly-telegraphed plot twists or dress up in extravagant robes and have her manservant Hubert run around asking everyone where Edelgard is in order to not seem conspicuous.
For Three Houses' reveal trailer at E3 2018, Cristina Vee voiced Edelgard. Tara Platt played her in the final game.