Malty S Melromarc

Malty S. Melromarc (マルティ＝S＝メルロマルク) later known as Bitch (ビッチ) is the primary antagonist of the series. She is the former first Princess of Melromarc who betrayed Naofumi Iwatani by lying about him sexually assaulting her.

After her lies were exposed, she was disowned from the royal family where she soon betrayed the other 3 heroes and she became a wanted criminal.

Appearance
Malty was first described by Naofumi Iwatani as a lovely girl with wavy semi-long crimson hair that is tied up in a ponytail with chest-length hair strands hanging on either side, emerald-green eyes, a pretty cute and youthful facial features, yet slightly shorter than Naofumi.

Even after her betrayal, Naofumi admits that she is a waste of beauty and describes her as needlessly attractive.

Personality
Malty normally presents herself to newcomers with her mask of a friendly and encouraging but flirty person. In reality, she is a malevolent psychopath with a myriad of negative traits. She is a consummate fraud who stands as a prejudiced, narcissistic, egocentric, haughty, dishonest, hypocritical, whiny, bossy, corrupt, vain, arrogant, conceited, depraved, shrill, treacherous, condescending, malevolent, sadistic, abusive, deceitful, selfish and tyrannical. On top of being highly adept at cheating and manipulating people for her own benefit, while not above insulting or making them as miserable as possible. Malty is also a first-class actress, often pretending to be a poor and harmless girl who'd stoop so low as to self-victimize in order to make people believe her empty word. She is deceptive enough to "cry" crocodile tears in order to fool people into taking her side, something the Queen calls her out for in the manga. Even after she was implanted with a spell that makes her feel an immeasurable pain when she lies, lying remains Malty's first - and perhaps only - reaction in any given situation, even when there is clear evidence of her malicious actions. An example of this is seen when she denies her sister’s accusation of attempting to poison the food Naofumi was going to eat even though she was caught red-handed as she was pouring the poison into the meal in the anime.

Malty will do whatever it takes to get her way and is not above any kind of foul play, willfully interfering in otherwise fair matches. She will readily commit atrocities to gain an underhanded advantage while at the same time considering everything that may disfavor her side "unfair," revealing her to be a sore loser on top of being a scoundrel. Even going as far as attempting to kill her own sister so that she could be the future queen, manipulating her father into believing that Naofumi kidnapped Melty. Having "hypnotized" her into being on his side.

Despite being cunning and intelligent enough to manipulate others, Malty is also shown to be rather stupid and easy to fool herself. Provided one knows her personality well enough to exploit these traits. This was shown primarily due to her own inflated sense of exaggerated self-worth on top of general over confidence tending to make her quite dumb and easy fool if her ego is flattered appropriately. This is noted by Biscas T. Balmus upon revealing his betrayal to her, completely shocking Malty due to misguided belief that the Church of Three Heroes was loyal solely to her thanks to her “masterful” manipulation of them, with the Pope himself noting on Malty’s immense stupidity when compared to the proper wisdom and intelligence possessed by her younger sister and mother. Later Rino was also later able to manipulate Malty by feeding her ego, ender in her being fatally stabbed in the back by her and shellshocked when Rino revealed her immense hatred of the fallen princess.

Malty is extravagant and goes as far as to use the country's treasury for her luxurious spending in daily life, cynically calling it "for the sake of the world." Her greed extends even towards villages ruined by the Catastrophe Waves, heavily taxing them beyond their means. Her mother mentioned that she already used her own body to gain some benefits - it is implied she went sexual on Motoyasu Kitamura in order to better control him. In spite of visibly supporting (or pretending to support) Motoyasu, she is ultimately out for herself alone and stands ready to betray anyone, even her own relatives, for her personal desires and goals.

Background
According to Mirellia Q Melromarc and Melty Q Melromarc, Malty hides in the shadows and enjoys bringing anguish to others. It is believed that the reason for such malicious behavior is because her father, Aultcray Melromarc XXXII, spoiled her rotten growing up, letting her abuse her authority without consequences. Malty's lack of discipline and repulsive personality led to Melty being chosen as heir to the throne over her.

To fix her bad personality, the Queen sent her to study abroad in a school at Faubrey. However, all that accomplished was Malty's "graduation" from virginity.

Trivia

 * Malty is in many ways the exact opposite of her sister Melty Q Melromarc that includes:
 * Their personality
 * Their appearance
 * Their magic specialty (water and fire)
 * Their color schemes (blue and white against red and brown)
 * Malty is very unskilled in the game of chess, and she was ranked lowest among her own family members. She can "win" only against Aultcray Melromarc XXXII, who held back in order to let her win.
 * In The Reprise of the Spear Hero it is revealed that Bitch and Melty had a brother, the middle child of Mirellia and Aultcray. 10 years prior to the beginning of the story, their brother died while Melty was a child. Mirellia suspected that Bitch indirectly had her brother poisoned to stop an alliance with Siltvelt. Losing his son left Aultcray emotionally broken. It's implied this incident is what led to Bitch being able to slowly gain control of her father, turning him from a wise king into a fool wrapped around her finger.
 * Naofumi Iwatani personally considers Malty's handwriting to be messy, crude and plain ugly.
 * Queen Mirellia Q Melromarc has stated that Malty was not a virgin and that she has had several lovers.