Malty S Melromarc

Bitch (ビッチ), known earlier as Malty S Melromarc (マルティ＝Ｓ＝メルロマルク), 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
Bitch 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
Bitch normally presents herself to newcomers with her mask of a friendly, encouraging and flirty person, but she is actually a malevolent psychopath with a myriad of negative traits - she is a pathological liar who stands prejudiced, narcissistic, egocentric, haughty, dishonest, hypocritical, corrupt, arrogant, depraved, treacherous, malevolent, sadistic, abusive, deceitful, selfish and tyrannical. She is shown to be highly adept at cheating and manipulating people, and is not above insulting or making them as miserable as possible. She is (to an extent) cunningly deceptive enough to "cry" crocodile tears in order to fool people into taking her side. Something their Queen calls her out on in the manga. Even after she got implanted a spell that makes her feel an immeasurable pain and forces her to say the truth or when she's discovered, Bitch still possesses and retains her tendency to lie as her first and perhaps only reactions in any given situation, even when there is clear evidence of her malicious actions. An examples of this is seen when she denies her sister’s accusation of her she attempting to poison the food Naofumi was going to eat even though Melty saw and caught her red-handed pouring poison into his meal.

Bitch is also a first-class actress, often pretending to be a poor and harmless girl and victimizes herself in order to make people and believe her

Bitch 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 as well. She would go as far as attempting to kill her own sister so that she could be the future queen, manipulating her father making him believe Naofumi kidnapped Melty and "hypnotized" her to be on his side, and so more.

Bitch 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 simply for the sake of entry and exit. 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 blood relatives, for her vain, foolhardy personal desires.

Background
According to Mirellia Q Melromarc and Melty Q Melromarc, Bitch 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 while growing up, causing the elder sibling to abuse her authority without any consequences. Bitch's lack of discipline and repulsive personality led to Melty being chosen as heir apparent 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 Bitch's "graduation" from virginity.

Trivia

 * Bitch 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)
 * Bitch 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, who was 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 own brother poisoned to stop the alliance with Siltvelt. This event left Aultcray emotionally broken from seeing the death of his own son. 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 who she controlled with her fingertips.
 * Naofumi Iwatani personally considers Bitch's handwriting to be messy, crude and plain ugly.
 * Queen Mirellia Q Melromarc has stated that Bitch was not a virgin who has implied her daughter that she has had quite a few lovers.