Emilia Ludwell

Emilia Ludowell (エミリア・ルードウェル, Emiria Rūdoweru) was a pureblood royal and was the homeroom teacher of Anos's class. She was also the daughter of Elio Ludowell, one of the Demon Emperors, prior to her death. She now serves as the school director of the Hero Academy, after her reincarnation as a mixed-blood.

Appearance
Emilia is a young adult woman with long light purple hair which she keeps in a bun.

After her reincarnation, Emilia appears slightly younger, possessing long brown hair and matching eyes.

Personality
Emilia is proud of being royalty and is not happy about Anos, a mixed-blood, being extremely powerful. Emilia has been willing to give her students an opportunity to prove themselves, from time to time. When choosing teams within the class, Anos wasn't supposed to be a team leader due to his mixed blood. However after losing a bet to him, she allowed him to be a team leader. Despite acknowledging his skill, she still felt like Anos, as a mixed blooded demon had no business questioning or surpassing pure-blooded demons, and was willing to sabotage him to satisfy her standards, as shown when she attempted to sabotage Anos's dungeon exam and when she tried to steal his sword.

As a teacher, she acts composed and controlled, rarely losing her cool. She gives favoritism to pure-blooded students, seeing her mixed blooded students simply as thieves stealing knowledge from the purebloods and has no qualms injuring or even killing them if they cause problems for her.

She values her pure-blooded heritage highly and cannot accept being anything else. This is best shown when Anos reincarnated her as a mixed blooded demon and she immediately tried to kill herself.

Plot
Emilia went into the classroom and introduced herself as their homeroom teacher. She quickly told them they will be divided into two teams and to be a team leader you will need to be able to active a  spell. As she showed the spell and asked who would volunteer for a team leader, Anos volunteered. She told him, he can't be a team leader, as he was mixed-blood and only pure-bloods can be. He told her mixed-blood wasn't inferior to pure-blood and they agreed that if he can show something to surpass a royalty member, he will be allowed to be a team leader and Anos activated a contract spell, which surprised Emilia as she didn't see him draw a circle. He went to the spell and explained it had a flaw and fixed it, looking at it, Emilia realized the spell got better and Anos explained it became twice more powerful. Having no choice, Emilia approved him to be a team leader. She then proceeds with students introducing themselves and later appointed Sasha Necron as the other team leader and told the students to choose which side they take and that they could switch sides later.

When Anos advanced into the finale of the Demon Sword Tournament, she had intended to steal and break his sword, which was held by Anos's mother, Izabella, so that he could not appear in the final. While Anos was trying to save Sheila with Misha, she tried to fool Izabella by telling her a fake rule that stated the finalist's sword must be kept. However, his mother became suspicious of Emilia and wanted to confirm it properly. Knowing that she couldn't persuade her, Emilia started attacking Izabella along with 8 members of the Fan Union. The girls tried to defend Izabella using the anti-magic shields, but they were burnt by Emilia's  and collapsed. When Izabella asked why Emilia hurt her own students, she claimed that the mixed-bloods are not her students. Emilia then uses  again, but the girls managed to stand up and fight back. They told Izabella to run away, so she ran to call for help. The girls matched their power together but soon got blown away by Emilia's flames. Emilia aimed another  directly at Izabella but got distracted when the girls began to sing. Emilia got angry and burnt the girls one by one, but they didn't stop singing. Finally, all girls collapsed, Emilia used   and spotted Anos's mother. This time, she successfully released it. However, Anos has used  and appeared in time to save his mother. He healed Izabella's slightly-burnt-hand and turned to Emilia. Despite the fact that Emilia was quite far away from Anos, she still got scared and stepped back like she had been struck. Anos then said that he didn't remember a single time he got angry in his past life. With a cold voice, he said: "Emilia, you, I do not forgive."

Emilia was frightened by his bloodlust, trembled, and tried to escape by flying, but Anos's words were filled with anger and strong magic power, that broke through Emilia's anti-magic and restrained her body and magic power. Anos picked her up with one hand, ignored her question, and threw her on the ground. He walked over where the Fan Union girls had fallen and healed their bodies. The girls woke up and thought that they couldn't protect his mother, but Anos suddenly asked their names and said that he would remember their names for the rest of his life. The girls started to cry silently, Anos then turned again to Emilia. He grabbed her by the scruff of her neck, teleported them to the Arena so that his mother would not worry. He threw her on the floor, created a demon sword, and told her to use it to fight him. Emilia then pulled out the demon sword and slashed Anos. As soon as she did an electric current eaten into her body. Anos mocked her for not being able to handle a demon sword. Then he stepped on her head and pressed it against the floor. He then held the sword, forced her to beg, and admit that he was the Demon King of Tyranny. Emilia refused. Anos told her that the host body which was stabbed by this sword became a seedbed for a hundred poisonous rice worms that will fight and eat each other. They use the host's pain as a living source and the host's internal organs will be eaten. When one poisonous rice worm is left it merges with the power of the host. Anos started to threaten Emilia, she got scared and began begging him to stop. Anos told her she would eventually get stronger and could hurt him with her new power. Finally, she admitted he as the Demon King of Tyranny but he refused to help her. Emilia couldn't speak anymore and looked on with despair when Anos started counting down. But nothing changed. Anos then revealed that it was just a lie to make Emilia embarrassed about what she did earlier. Anos kicked her onto her back and thrust his hand into her chest and grabbed her heart, and killed her. He reincarnated Emilia as a different person with the mixed-blood of humans and demons. Emilia panicked and kept checking her blood again and again. She stood up and intended to kill herself but Anos told her that he had cursed her to be reborn as a mixed-blood and that she couldn't escape from his curse. Anos tells her to roam Dilhaide, while in her new physical station, in order to view the world in a mixed-blood's perspective and to amend her biased views. Anos then used  and left the arena, leaving her to wallow in her own devices.

Abilities
Emilia is a decently powerful demon, as she was able to overwhelm eight members of the Anos Fan Union single-handedly.

High-temperature Flame (Gusgum): Fire attribute magic. It's noted that Emilia's gusgum is purple and black, unlike Anos's red and black.

Anos Voldigoad
Emilia hates Anos with a burning passion, which mostly stems from his status as a hybrid student. While she does recognize and even fear Anos's power, she staunchly believes that she's still superior over him due to her pureblood status as a Ludowell. Her hated grows even stronger after Anos humiliates her brother in the Demon Sword Tournament. This prejudice has led her to harm other students, and engage in shady activities in attempts to undermine him. Her disdain, now joined by fear of him, carries over to her reincarnated hybrid form, as her original death at his hands has left her emotionally scarred.

Krut Ludowell
Emilia is extremely proud of her older brother thanks to his accomplishments in the Lognorth Demon Sword Association, and also holds him in extremely high regard. She was extremely furious when Krut lost to Anos Voldigoad in a minute on the dot just as he said.

Trivia

 * Anos's torture of Emilia is toned down in the anime, with Anos not threatening to turn her into a rice worm.
 * Emilia is not able to wield a Demon Sword, as her magic power was drained by one during Anos's torture of her.