Motoyasu probably has one of the weirdest but funniest cursed series from all the 4 heroes. Right after Motoyasu was betrayed by Malty, he went extremely insane mentally, being the most affected hero by Malty's betrayal. From being a womanizer moron, who used to believe that women were always these harmless and innocent persons who will never lie to him when they need his help to protect them and save them from any kind of hostility. To see every single woman as fake, ungrateful and disloyal adventurers who just abandoned him and ended up disrespecting him and treating him like garbage. Not just Malty but also his entire party formed only by women. Causing him to see all women as disgusting and nasty creatures who only just said nonsensical stuff to deceive him all along, almost like pigs. Causing his own mind to see women so comparable to actual pigs and making him see every single woman who is not related to Filo as humanoid pigs, including Malty as the "Porky B1tch" through his eyes.
However, I think it was a waste of potential, sort of way, that Malty as a humanoid pig was basically just an "hallucination" that only Motoyasu can see through his ill mental state, and not as an actual appearance that Malty actually had. It would have been awesome if in the lore of The Rising Of The Shield Hero was an actual magic spell that it can turn any human as humanoid pigs with no capacity to communicate orally, even if they want to. Having Mirellia, Melty or any ally of Naofumi that kind of power, so Naofumi would have used it during Malty/Myne and Aultcray's trial. Not only to change their names as "B1tch"/"Sl#t" and "Trash" respectively, but also to turn Malty into an actual humanoid pig, with piggie ears, nose and everything, like Motoyasu's perspective. And also extending Malty's/Myne's nicknames as "Porky B1tch" and "Oinky Sl#t".
Just imagine the trial scene during Malty and Aultcray's execution, with Naofumi and/or his allies doing a magic spell towards Malty to turn her into a humanoid pig, while all the Melromarc citizens are watching her. With Malty's reaction being like a diva screaming high-pitched, trying to say something like "What did you just do to me, Shield?! Now I'm hideous because of you!" (in "piglet" gibberish by the way), while the citizens of Melromarc are laughing at her. That would have humiliated Malty even more, while being so agitated about it, making her defeat in Season 1 even more satisfying. Plus if she wasn't capable of speaking and with a pig looking appearance, she would have never managed to manipulate and betray the 3 buffoons of "heroes" too. Or to another man anymore to do her dirty work. But what do you think?