Level 99 Villainess

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Yumiella Dolkness is the main character who was reincarnated as the hidden boss of an otome game.
Appearance: A girl with long, perfectly straight, jet-black hair and dark eyes. Because of her black hair, which is rare in this world, people often avoid her or consider her "sinister." She wears a standard academic uniform and has a petite build, despite her incredible physical strength.
Personality: She possesses a healthy indifference, is melancholic, and extremely rational. She is a bit withdrawn (her gaming background is evident), and thinks practically and straightforwardly. She is completely devoid of coquetry and often overlooks hints, but at the same time, she sincerely strives for a quiet life, is devoted to her friends, and has a strong inner core.

Patrick Ashbaton is the son of a Border Earl, a student at the academy, and Yumiella's main romantic interest.
Appearance: A young man with short silver-gray (or light ash) hair and a serious gray gaze. He is well built and looks like a reliable warrior.
Personality: Responsible, sensible, and mature beyond his years. He serves as the "voice of reason" (tsukkomi) in the story. Patrick is one of the few who isn't intimidated by Yumiella's black hair and level, recognizing her kind and slightly quirky nature. He's caring, patient, and always ready to help.

Alicia Ehnleit is the main protagonist of the original otome game, a commoner with light magic.
Appearance: A charming girl with soft pink shoulder-length hair and large, expressive blue-green eyes. The typical "innocent saint" image.
Personality: Optimistic, kind, and cheerful, but initially extremely timid and suspicious. Due to her keen sense of dark magic, she was for a long time terrified of Yumiella and suspected her of being the Demon King. Over time, through training, she becomes more determined and self-assured.

Edwin Valschein is the second prince of the kingdom and one of the main favorites of the game.
Appearance: A classic prince with well-groomed blond hair and blue eyes. He has an aristocratic bearing.
Personality: Proud, initially arrogant, and prejudiced. He blindly protects Alicia and has long treated Yumiella with hostility and suspicion. Over time, he learns to acknowledge his mistakes and accepts responsibility as a future leader.

Oswald Grimsarde is a brilliant mage who specializes in the four main elements.
Appearance: An intellectual-looking guy with neat blue hair and glasses.
Personality: Cold-blooded, arrogant, and slightly aloof. He was proud of his magical talent until he encountered Yumiella's sheer power, which severely bruised his ego and forced him to rethink his abilities.

William Ares is a student training to become a knight and an expert in close combat.
Appearance: A tall, muscular young man with short, bright red hair and a fighting spirit.
Personality: Hot-tempered, straightforward, and stubborn. Used to solving problems by force. For a long time, he recklessly tried to challenge Yumiella to a duel, not realizing the enormous difference in strength, but he is loyal to his friends and always eager to fight for a just cause.

Eleanor Hillrose is the daughter of the Duke, the leader of the radical faction of the nobility.
Appearance: A stately girl with luxurious long golden hair, styled in vertical curls (drills), typical of capricious aristocrats.
Personality: A true "dumb blonde," but in an entirely positive way. She's incredibly eccentric, hyperactive, and enthusiastic. She's unrequitedly in love with Prince Edwin. Eleanor is completely incapable of keeping secrets, but she's also devoid of malice and arrogance, becoming Yumiella's first and most sincere friend among the girls.

King Valshain
Appearance: A mature man with noble features, neat hair, and a reserved, regal bearing. He dresses in the traditional, luxurious attire of a monarch, but without excessive pretentiousness.
Personality: A sensible, calm, and unprejudiced leader. Unlike many other nobles, he doesn't shun the main character, Yumiella, because of her "cursed" black hair and mastery of dark magic. He quickly recognizes the immense combat value of the level 99 Yumiella and strives to use her power for the good of the state, while diplomatically attempting to channel her pragmatism into peaceful channels.

Queen Walshine
Appearance: An elegant woman with soft features, refined manners, and neatly styled hair. Her appearance emphasizes her maternal care (she is Prince Edwin's mother) and the high status of a ruler.
Personality: A perceptive, polite, and intelligent woman. She shares her husband's political realism and treats Yumiella with great respect and warmth, understanding her true motives. The Queen often engages in subtle dialogues with Yumiella, involving her in solving the kingdom's major problems (such as the threat of a demon invasion), and sincerely appreciates her straightforwardness.

Appearance
In the anime itself, their appearance is given little screen time, but they look like typical, arrogant and well-groomed middle-aged aristocrats:
Count Dolkness (father): A man with light-colored (brown or brown) hair, dressed in expensive class attire. He has an arrogant look, expressing disdain for anything that does not benefit him.
Countess Dolkness (mother): A woman with aristocratic features, an exquisite hairstyle, and voluminous dresses. Like her husband, she appears squeamish and cold.
The main difference from her daughter: Both parents have blond hair. That's why Yumiella's jet-black hair came as a shock to them, as in their kingdom, that color is considered a "cursed" sign of evil.
Character
Yumiella's parents are typical selfish, cowardly, and calculating nobles, devoid of any parental love. Their personalities are revealed through the following traits:
Indifference and cruelty: When Yumiella was born with black hair, they feared a bad omen, considered her a "monster," and immediately exiled the infant to a remote provincial estate. They never visited their daughter and completely ignored her, leaving her in the care of servants.
Political Opportunism: They live solely for profit and power. For a long time, they were part of a faction of disgruntled nobles plotting against the king. When Yumiella grew up and achieved the incredible level of 99, they weren't pleased with their daughter's success, but immediately tried to use her as a political "weapon" for their own selfish ends.
Cowardice and baseness: Realizing that Yumiella was too strong, unmanipulable, and supported the current king, they became afraid of her. Instead of trying to mend their relationship, the Count and Countess cowardly hired assassins to eliminate their own daughter (which, of course, failed due to her absolute invulnerability).