Malty S Melromarc/Relationships

Naofumi Iwatani
Malty is ultimately the cause of Naofumi's dark and cynical personality due to the fact that she betrayed him and falsely framed him for the attempt of raping her for no other visible reason. Naofumi's originally kind personality snapped violently, he became distrustful of anyone who is not a slave, and for a very long time held contempt for women in general. She continued to make him suffer by every means of opportunity, like trying to take his slave away from him and interfering in the duel for ownership of his slave, calling him a criminal and framing any crime possible. When Naofumi's name was cleared, the queen gave the choice of punishment for Malty to Naofumi. Malty uses her craftiness and appeal to craft a facade of contrition towards Naofumi, with the intention of nullifying her punishment. But she was seen through, and he demanded the death penalty. This was the first and only time for Malty to call Naofumi by his name. After been talked down, her punishment was having her completely stripped of her royal status and her name changed to "Bitch."

Since then, Malty has grown to hate Naofumi more personally and fails to repent or accepted that she got what she deserved. When she approached Ren and Itsuki after the Spirit Tortoise incident, she tricked them into believing that Naofumi was the real evil and that she was the victim, referring him as the Shield Demon. Part of the lies she told them included saying that Naofumi was the one who unsealed the Spirit Tortoise, was working his slaves too hard and keeping all the profits to himself (something Naofumi agreed was true despite everyone on his side pointing it wasn't), and not using the powers of the Shield to bring back people's loved ones who had died, lying to Itsuki that it was a special power that only the Legendary Shield had. Even after betraying them, stealing everything they had, and then leaving a note where she admits these things while also insulting them, she still has the nerve to tell them that all her problems are Naofumi's' fault and she might be willing to love them if they kill him.

Motoyasu Kitamura
Motoyasu is the Hero that Malty joins for most of the story. After betraying Naofumi, taking his stuff, and framing him for an attempt of raping her, she gives Motoyasu the stolen chain mail and convinces him of her being the victim. Motoyasu completely trusts her; due mostly to his extreme gullibility, he ends up being used by her in most cases, such as leading him to nearly take Raphtalia away from Naofumi and levying a heavy tax on the village after Motoyasu became its lord. She seems to have sided with him purely because of his good looks. She easily convinced Motoyasu of falsely claiming Naofumi of having a "brainwashing shield," by which he supposedly brainwashed the people, kidnapping the second princess and killing Ren and Itsuki.

Later, when the charges on Naofumi were absolved by the Queen, Motoyasu refused to accept that Malty was the one who framed Naofumi for the longest time; Motoyasu also seemed to pay little attention to Malty's suspicious behavior such as she giving a hard time for other female party members and kicking them out (even selling the one named Rino as a slave to a noble), her exceptionally wasteful spending which she claims it was for the "for the sake of the world," and also her attempt to kill Melty, which Ren and Itsuki have noticed but he didn't. Motoyasu even agreed to shoulder her debt to some extent. After the Spirit Tortoise incident, she abandons him completely. After that, he saw her badmouthing him to Ren of many false charges, which causes his mind to break to the point where he now literally sees all women (with exception to Filolial Queens and some other women) as pigs, indirectly resulting in the awakening of his Legendary Spear's Curse Series.

In the spin-off story "The Reprise of the Spear Hero," Motoyasu still recognizes Malty, to some extent as he can only see and hear her like a pig, thus he was always wary of her and warn others about her.

Ren Amaki
Ren believes her accusation of Naofumi's attempt to rape her and berates Naofumi without hearing his side of the story. Later, Ren along with Itsuki points her involvement in the foul play of the Sacred Duel between Naofumi and Motoyasu and stands for Naofumi. Ren was the first to notice Malty's attempt to kill Melty and begins to deeply suspect of her and starts his own independent investigation with Itsuki. When all of her crimes brought to light by the Queen while clearing Naofumi's charges, Ren, along with Itsuki, agrees with the punishment to Malty befitting. After the Spirit Tortoise incident, Malty approached Ren and took advantage of his emotional state to manipulate him and use him to escape from Naofumi arresting her.

She later decided he'd be of little use, stole everything of value from him, left him a note belittling him, and joined Mald's revolution, causing Ren's already fragile mental state to fall completely and succumb to the dark influence of his Legendary Sword's Curse Series. Ren, like the other Heroes, now holds the same contempt and hatred for Malty, however Malty herself is shown to be largely unaffected by his grudge against her and Malty in her arrogance and self-absorption, still believes that she could still manipulate him to do her bidding despite her actions towards him.

Itsuki Kawasumi
He along with other Heroes believed Malty's false rape charges on Naofumi and berated him as well. But he and Ren still questioned her involvement in the Sacred Duel between Naofumi and Motoyasu. After Ren's persuasion, Itsuki agrees to investigate the abduction case on Naofumi. He along with Ren calls out on her illegal involvement in the Duel and stands up for Naofumi. After her past actions were brought to light by the Queen, he along with Ren agrees with her punishment to be befitting. During their stay at Cal Mira Island, he said that Malty spoke in good terms to him before the punishment.

Sometime after the Spirit Tortoise incident, Malty approached Itsuki and took advantage of his emotional instability like she did with Ren. She told him all kinds of lies to convince him that she was trying to save people from slavery and that Naofumi was evil. This seemed to have activated the Pride Curse Series and caused him to only believe those who praised him such as her. He also began fighting at the coliseums in order to raise money for her and his former party, believing they were using it for their "noble" cause of saving people, unaware that they were just been leeching off of him and wasting his money on themselves. Like with Ren, she later decided to take all his money while leaving him in debt, leaving him a similar note of her berating everything about him.

In the "Reprise of the Spear Hero", Due to Motoyasu already knowing of her true personality and his own mental instability and seeing her only as a "red pig", she could no longer manipulate him to do her bidding and he actively avoided her, causing her to instead latch on to Itsuki and successfully manipulate him to do what she wants with little trouble.

Aultcray Melromarc XXXII
Aultcray, the Hero of the Cane, was her father. He was a doting parent and spoiled her too much. Most of her evil personality stems from this upbringing, or at least that is what it was thought. Even if she causes any trouble, she pins it on someone else and he will punish the victim without any thoughts. She gets away from anything with the help of her father. Trash supported Malty in framing Naofumi of fake rape crime. As a King, he gave too much preferential treatment and blatant favoring to the Spear Hero with the sole reason of Malty being in his party.

As seen from the King's reaction during their trial, Aultcray himself genuinely believes all of Malty's lies of whatever she tells him to justify her vile actions. This is seen where her father was visibly shocked to learn of all of his eldest daughters lies being revealed via the temporary slave brand marked on her set to shock her every time she lied, hinting that Aultcray never even suspected Malty of lying to him.

However due to her actions of helping Takt and her later encouraging him to kill Queen Mirellia, her own mother and him later doing so to her own pleasure, Aultcray was shown to have been completely horrified by his own daughters actions and later fall into shock upon realizing Malty's true character. This would later cause the King to fall into a deep depression due to losing his wife and his own favorite daughter being responsible and finally realize Malty's true character.

Later upon recovering thanks to Naofumi, Aultcray orders her execution despite his personal attachment to her for the sake of his country and finally have Malty pay for her crimes. However she later managed to escape custody before it could be carried out.

Raphtalia
Understandably, Raptalia hates Malty for what she did to Naofumi and holds her as a personal enemy. Malty seemed to consider Raphtalia nothing but an annoyance and (as most noble people in Melromarc usually do) a lowly demi-human.

Melty Q Melromarc
Malty has no affection for her younger sister and sees her only as an obstacle between her and Melromarc's throne. Melty, on the other hand, cares for her sister's well being (even after Malty attempted to murder her) but also understands that Malty needs to be punished and held accountable for her crimes.

Mirellia Q Melromarc
Similar to her sister, Malty has no affection for her mother. While Mirellia loves Malty dearly, her loyalty is with Melromarc. The queen was put in the reluctant position of punishing Malty and using her as a political tool in order to save Melromarc since Malty had nearly caused a world-wide war. During the negotiation, Mirellia arranged Malty to be married with King Faubrey which is seen in noble courts as a horrible punishment. To stave off the marriage, Malty remained with Motoyasu as a companion until she could escape. However, Malty's hatred of her mother festered during this time.

Anime Spoilers

Elena Haven/Girl 1 (former)
Though she hates Malty, she pretends to get along with her, so that she doesn't get into any trouble. She also suspects Malty's claims of Naofumi's attempt to rape her but decided to ignore it. She knows all of Malty's wrongdoing in the party and also her involvement in kicking others out, but played along to keep herself in the team. She felt that, in the near future, Malty will abandon Motoyasu and she hopes to claim him for herself. After the Spirit tortoise incident, she abandoned her teammates and left without turning back. She tells Naofumi that Malty is a person who will out lives at the cost of others and believes that she survived the spirit tortoise.

Lucy/Girl 2 (former)
She was a school friend of Myne. She teamed up with Spear hero after a couple of days of Malty becoming his party member. She was mentioned to be noble. She shared the same mindset of Malty in many ways and was almost similar to her, thus got along with her and joined in on all of the evil acts. Notably, despite how she had betrayed Motoyasu, Ren, and Malty. She remained loyal to Malty, until Malty's failed rebellion. Naofumi not knowing her name called her "Woman 2." It is unknown why she was so loyal to Malty since she was a noble that was not obligated to serve a former princess, but she was also faced a fate similar to the Witch.