Motoyasu Kitamura/Relationships

Naofumi Iwatani
It would be a severe understatement to consider the start of Motoyasu's relationship towards Naofumi as mere hostility. In one of their first conversations, Motoyasu openly calls Naofumi "useless" due to his Shield. When Malty made her false rape accusation against Naofumi, the person she went to was Motoyasu, who immediately believed her lies and causing his opinion of Naofumi to deeply worsen.

Their every interaction typically follows the pattern of Motoyasu yelling at Naofumi for whatever 'crime' he has committed on that occasion and trading insults, which mostly results in him getting kicked away by Filo. Naofumi's scorn for the Spear Hero goes so far that he's given Filo the standing order to kick him away (mostly on his crotch) every time she sees him.

Following his awakening to the Lust Series of his Legendary Spear, Motoyasu's view of Naofumi turns 180 degrees: having fallen in love with Filo, Motoyasu views Naofumi as a "father-in-law," as he had raised Filo "like a daughter," therefore taken as a gospel or irrevocable law everything Naofumi tells him, to the point that he will blindly obey the Shield Hero, even if he dislikes or disagrees with it.

Naofumi, for his part, sees the broken Motoyasu at best as a "useful idiot" to be readily exploited and discarded, or at worse as an annoyance to be pushed off or tricked into going as far away as possible.

Ren Amaki
Little interaction is seen between Ren and Motoyasu, though they appear to get along on the surface they are far more interested in competing to slay the Bosses of the Waves when they are supposed to be working together. The two of them are also quick to snap at each other when their information from their respective games do not line up. At the very least, prior to his curse, Motoyasu did not hate Ren enough that he would let Malty have her way with him when he learned her true nature.

In The Reprise of the Spear Hero, when post curse Motoyasu realized that he had unlocked a spear that would send him back to the day of the summoning ceremony every time one of the heroes died he did not hesitate to kill Ren to confirm his theory.

Raphtalia
Motoyasu was under the impression that Naofumi was forcing Raphtalia to be his sex slave and tried to "save" her in a rigged Sacred Duel with Naofumi, but was shocked when Raphtalia slapped him for his actions. He argued that no one should be forced to fight (which is big hypocrisy, considering that he and King Aultcray had coerced Naofumi into the duel moments prior), but still she chose to follow Naofumi. The other Heroes called out on him not only for his unjustified duel but also for the distorted way he insisted on seeing Raphtalia's relationship with the Shield Hero.

He again tried to defend himself by claiming that Raphtalia must have been brainwashed, to which no one agreed. When Naofumi was accused of "having a brainwashing shield", having received "evidence" to back up his delusional claims, he fought with renewed vigor to try to "free" Raphtalia and another female companion from Naofumi's supposed brainwashing.

After Naofumi's name was cleared, he no longer sought to free Raphtalia, and even acknowledged Raphtalia's genuine feelings for the Shield Hero, as he questioned Naofumi on his progress with Raphtalia in the bathhouse of Cal Mira Island, only to be angered by Naofumi's obliviousness to her feelings. After his Curse Series activated, he could only see Raphtalia as he would view any non-Filolial woman: a pig, referring to her as a "tanuki pig."

Rishia Ivyred
According to Motoyasu, Rishia is ranked fourth among his "cute girl ranking" after Malty, Raphtalia, and Filo in that precise order. Rishia is the only girl that Motoyasu has been shown unwilling to flirt with, however, this isn't out of any form of respect but rather fear. Having met Rishia on Cal Mira Island after she had been kicked out of Itsuki's party, Motoyasu felt sympathy for the girl, but at the same time, it was a dance he had done before.

Having already provided emotional support to a girl in a similar position back in his own world, and eventually getting stabbed to death as his reward, Motoyasu's response to hearing Rishia's story about her departure from Itsuki's group was to push the problem off on Naofumi as quickly as possible. Post-Curse Series Motoyasu views Risha the same way he would view any non-Filolial woman: a green-haired pig.

Aultcray Melromarc XXXII
Due to being the Hero whose party his daughter was a part of, Motoyasu received a lot of favorable treatment from the King - it is even mentioned that the King personally gave Motoyasu requests to complete and when the time comes to hand out payment to the four Heroes, Motoyasu had received slightly more than Itsuki and Ren. Additionally, it also seems that Aultcray stockpiled rare materials for Motoyasu to use in his weapon reinforcement method.

Post-Curse Series Motoyasu is a different story, as he now despises the King for his treatment of Naofumi and refers to him only as "Trash," the new name chosen by Naofumi as his punishment.

Malty Melromarc (former)
Motoyasu always defended and believed Malty. Malty also got jealous of any girl who got close to Motoyasu, she even kicked a few members out of his party without his knowledge. The only thing she liked about Motoyasu was his good looks. He believed every word coming from her mouth without any doubt. Motoyasu never noticed any of her suspicious behavior. He was the only one who refused to believe Malty to be a criminal, even after all the glaring evidence was presented and she had been questioned about her crimes while under the influence of a slave seal that forced her to tell the truth, and continued to believe in her.

It was revealed that both of them had a physical relationship which Motoyasu believes to be her first time. But Malty and her friend just used to seduce him for their own personal gains. After the Spirit Tortoise incident, she completely abandoned him. Despite this, he kept on searching for his "comrades," only to be shocked by the real personalities of Malty and the others.

The current Motoyasu's opinion of Malty can best be summarized by his name for her: the "Red Swine," and even refers to her as such in his memories of her prior to his insanity.

Elena Haven (former)
Unlike the other party members, she genuinely liked Motoyasu. She was not bothered by his interest in other women and considered it normal for men to have pleasure. She went along with Malty to secure her place in his party. But she couldn't digest his rash and irrational behaviors. She also didn't like how he used her and other women as a status symbol. Finally, she had had enough of being in his party and abandoned him, after seeing that he was unable to do anything against the Spirit Tortoise. To save herself from crown's capital punishment, she sold out Motoyasu and told all of his flaws to his face, much to the latter's dismay.

Rino (former)
Motoyasu wooed her to try to get her to join his party. But when she joined, Rino was taken aback by his party's fighting style where the women cheered while Motoyasu was fighting and showing off. Malty and some other female companions took her and sold her as a slave, and they told him that she left the party, as she couldn't keep up with them. Motoyasu once crossed paths with her after she became a slave but was deaf to her cries for help, refusing to believe that she was even there. Her fate after this remains unknown, except for her suffering as a slave.

Filo
Filo hated Motoyasu from the moment they met, mostly during the Riyute dragon race because he arrogantly called Filo fat and considered the Filolial was no match for his race dragon, and she immediately sent him flying through the air. Naofumi has given her the standing order to send Motoyasu flying with a kick (to his crotch) every time they meet. When Motoyasu saw her human form for the first time, he immediately developed a crush on her, on account of his fetish for angels - unfortunately for him, he insulted her monster form for a second time, calling it a "fat bird," and was rewarded with a second crotch kick sending him flying. During the four Cardinal Heroes' battle against the Church of the Three Heroes treacherous Pope, Filo constantly referred to Motoyasu as the "annoying Spear Guy" behind his back.

After being betrayed by his comrades and succumbing to his Spear's curse, Motoyasu was completely broken. Seeing his broken spirit, Filo tried to cheer him up and ended up as his goal of affection, much to her dismay. He caused Filo a new trauma of not letting go. Naofumi used Filo to manipulate Motoyasu into fighting the Waves with him.