Emilia Ludwell/Synopsis

Demon King Academy Arc
Emilia introduces herself to Class 1-2 as their homeroom teacher. She quickly tells them they will be divided into teams and that to be a team leader one must be able to active the spell Gyze. As she shows the spell's magic circle and asks who wants to volunteer as a team leader, Anos raises his hand. Since mixed-bloods aren't eligible to become team leaders, she turns him down. But Anos replies that mixed-bloods weren't any inferior to pure-bloods and they make a deal with Zecht stating that if he can do something to surpass a royalty member, she will accept his nomination, otherwise he will have to apologize and drop out of school.

He goes to the magic circle and explains that it was flawed, but Emilia objects since no flaws have ever been found in 2,000 years. Anos tweaks it a little bit, and she immediately sees that the spell's effect is 1.5 times higher, but he corrects her by saying that it was doubled. Having no choice, Emilia approves his nomination. She then asks the candidates to introduce themselves and tells the rest of the class to follow the leader of their choice. Emilia also explains that there isn't a limit to how many people can be in a team and that they can switch teams anytime; but if a leader had zero members, they will lose their position.

When Ivis Necron of the Seven Demon Elders was scheduled to give a special lecture to the class, Emilia implores Anos to refrain from doing anything impolite. However, Anos stands up and talks to Ivis casually, causing Emilia to bow and earnestly apologize for his behavior. She also states that Anos will be expelled immediately, but Ivis says that it won't be necessary. As the two continue talking, Anos walks up to Ivis and grabs his face, causing Emilia and the whole class to freak out. In the end, she was surprised that Ivis let Anos return to his seat unpunished.

She later approaches Anos to give him Misha's badge, stating a member from his group dropped it. When he asks which one, Emilia oddly replies "The one who's not Sasha". In the afternoon, Emilia meets with the class outside the castle's dungeon to inform the about the Dungeon Exam.

Demon Sword Tournament Arc
After Anos advances to the Demon Sword Tournament's finals, Emilia approaches Izabella to take away Anos' sword in an attempt to disqualify him. She tries to fool her by saying that the finalists' swords must be kept by the committee until the finals, but Izabella becomes suspicious of her. Knowing that she couldn't persuade her, Emilia attacks Izabella and the girls from the Anos Fan Union. She then fires Gusgam towards Izabella, but the girls block it using anti-magic, allowing Izabella to escape. However, the barrier eventually breaks and they end up getting burned. When Izabella asks why Emilia would hurt her own students, she states that the mixed-bloods are not her students.

Emilia gets furious since the girls keep standing up and singing their annoying song, so she uses Gusgam until their burns are so severe that they can no longer stand up. She then uses Fless to spot Anos' mother from the sky and fire Gusgam at her, but Anos teleports in time to save her. Despite the fact that Emilia was quite far away from Anos, she steps back like she had been struck when Anos calls her name. Frightened by his blood-lust, Emilia tries to escape by flying, but Anos uses compulsion magic on his words to stop her.

After healing the Anos Fan Union and asking for their names, Anos grabs Emilia by the neck and teleports the two of them to the Arena so that his mother would not worry. He throws her to the floor and creates a demon sword so that she can use it to fight him. Emilia pulls out the sword and slashes Anos, but as soon as she did, an electric current eats into her body and she lets go of it. Anos mocks her for not being able to handle a demon sword, and then steps on her head and presses it against the floor.

He then summons the sword to his hand and tells her that he might reconsider if she admits that he was the Demon King of Tyranny. However, he ends up stabbing Emilia when she refuses. Anos explains that people stabbed by this sword become a seedbed for a hundred poisonous rice worms that will fight and eat each other. The bigger they get, the more pain their host will be in. When one rice worm is left, it merges with the power of the host, turning them into the rice worm. As he continues telling her that she will soon become a rice worm, she gets scared and begs him to stop. When Anos says that it was almost time, a tearful Emilia admits that he is the Demon King of Tyranny, but he refuses.

Emilia couldn't speak anymore and just looked in despair as Anos started counting down. When it reaches zero, nothing changes, so Anos reveals that it was just a lie to mock her. Now full of hatred, Emilia vows revenge against him, stating that even if she can't do it, her children will; if not them, her grandchildren will, and so on. However, Anos returns the glare with ten times the hatred, stating that he will teach her the real reason why he spared her.

He then kicks her onto her back and thrust his hand to grab her heart, killing her. But afterward, he reincarnates Emilia as a mixed-blood, and no matter how much she looks at her new blood, she is no longer a Royal Demon. Going crazy, she picks up the demon sword on the ground and tries to kill herself, but Anos tells her that he had cursed her source so that she is always revived as a mixed-blood. Finally, Anos tells her to look at Dilhade from a mixed-blood's perspective and amend her biased views, before teleporting away.