Army of the Waves

Medea Pideth Machina (メディア・ピデス・マーキナー) is a character in The Rising of the Shield Hero.

Appearance
Medea's appearance is physically identical to that of the late princess Malty "Witch" Merlomarc, who was a small fragment of her being.

Personality
Medea is an evil entity with a god complex that enjoys the suffering she inflicts on other living beings. Being the one behind Malty and the Waves' exsitence, she rarely manifests physically, letting her fragments to do their job of destroying worlds and draining their energy to empower her even further. Just like Malty, she enjoys manipulating others for her own amusement. She's also unusually bloodthirsty compared to other "gods" like her, as she'd rather drag out the suffering and despair of the worlds she manifests in, while being fully capable of instantly destroying them and sucking them dry.

Abilities
The spirits of the legendary weapons mentioned that even they cannot defeat her in a direct confrontation. Their only hope of defeating her is to prevent her from entering their world in the first place. She is able to manipulate heroes like Kyo, reincarnate people like Takt, and manipulate the functioning of the legendary weapons to some degree.

Background
According to Arc, who hunts evil and maddened wannabe gods like her, Medea was a human from another world, a world that became advanced enough to make its people truly immortal and allow them to travel to other worlds. She, like a few other humans in her situation, was driven mad by her newfound power, becoming the unhinged monster she is now.

Seeking to make herself even more powerful, Medea forcefully merged eight different worlds with each other, to drain the energy out of them once they were destroyed by the resulting Waves of Calamity. To lenghten the suffering of the worlds' natives, she sent shards of herself that acted as her eyes and the reincarnated souls of her most loyal servants.

Volume 16
While Naofumi is communing with the Spirit of the Shield, he is warned of a 'World Eater' who is the original enemy of the Legendary Weapons. This entity is so powerful that the heroes have no chance of winning in a direct fight so they must prevent it from entering their world. Both Kyo and Takt are revealed to be advance troops for this entity, trying to weaken the world's heroes. The Shield's power-up method was kept hidden by this entity and the Seven Star Gauntlets had been interfered with in the past.

Relationships

 * Vassal Wielders
 * Aultcray Melromarc XXXII (Trash): Trash is the father of one of Medea's soul fragments, Malty. As Trash had personally executed Malty the second time, via burning at the stake, he shows a heavy amount of emotional sorrow for his actions. As Medea had revealed the truth about Malty's existence, where she used an imitation of Witch's voice to state her fragment's rage over how her father executed her, this had caused Trash to hesitate until Naofumi had snapped Trash back to his senses, as he reminded him about Melty. Trash then began to show his first signs of hatred towards Medea as she revived Queen Mirellia and controlled her into leading her soldiers. While Medea had again begun begging for mercy from Trash, she had already long passed the limit to what could be forgiven, even if they were father and daughter, where Trash responded, "You are no daughter of mine! You dropped people into despair and laughed at them with scorn. You’re just… a devil pretending to be of my own flesh and blood!," thus showing that Trash had cut off any and all emotional ties to Malty as the father resumed to help everyone vanquish the malevolent goddess.


 * Legendary Heroes
 * Naofumi Iwatani: Her hatred of Naofumi, inherited from her fragment, Malty, is extreme because of the constant meddling in her affairs caused by the young Hero, as well as her suffering by his hand, regardless of the fact that said suffering was well deserved. She killed Naofumi immediately by erasing him from existence in every world and timeline, as well as the divergent world in which he existed, however, thanks to Arc, he survived, became a god himself and came back. Arc himself noted upon hearing about her method of killing him that "she really, really, wanted you dead, man." The deified Naofumi and Raphtalia promptly defeated her alongside the other Heroes and their allied forces. Ultimately, Naofumi reflected her all-existence erasing magic back at her, killing her in every world and divergent world that she existed in, then took her powers and used them to undo all the damage she caused before, all this after beating her with humiliating ease.


 * Others
 * Reincarnated: Medea's chosen warriors, whom she would manipulate to the point where the reincarnated delude themselves into believing that they were fighting for justice and that their enemies were the "embodiment of evil." As they were cornered, where they pleaded to their goddess for more power, Medea did not hesitate in killing them all simply out of the pleasure of seeing them suffer, as she deemed them no longer useful to her.

Trivia
Information to be added later on.