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 royalty and her name changed to "Bitch".

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. Motoyasu, due mostly to his gullibility, ends up being used by her in most cases, such as leading him to nearly take Raphtalia away from Naofumi, levying a heavy tax on the village after Motoyasu became its lord. She seems to have sided with him purely because he has a good-looking face. She easily convinced Motoyasu of falsely claiming Naofumi of having brainwashing shield by which he supposedly brainwashed the people, kidnapping the second princess and killing Ren and Itsuku.

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 hard time for other female party members and kicking them out (even selling the one named Rino as 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 Spear's Curse Series.

In spin-off story "The Reprise of the Spear Hero", Motoyasu still recognizes Malty, to some extent as he can only see and hear her as 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 duel between Naofumi and Motoyasu, and stand 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, leaving a note of berating him and joined Mald's revolution, causing his already fragile mental state to fall completely and succumb to the Curse Series of his sword.

Itsuki Kawasumi
He along with other heroes believes her charge on Naofumi of the attempt to rape her and berates him. But he still questions her involvement in the 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 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 her punishment to be befitting. During Cal Island, he says that Malty speaks in good term with him before the punishment.

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 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 for the Spear Hero with the sole reason of Malty being in his party and favoring him.

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 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 has also faced a fate similar to the Witch.

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 a lowly demi-human (as most noble people in Melromarc usually do).