Gorm (ゴーム Gōmu, also commonly translated as Goomu and known as Gôm in the French Kana manga) is a large, beetle-like mamodo who is notable for his ability to create portals that allow him to travel through another dimension to anywhere in the world as well as using Black EnergyMagic, a type of destructive magic. He was introduced as a minion of Clear Note, but betrayed him after making friends with Kanchomé, which led to his defeat by his own master. He is extremely powerful in his own right, though his intelligence is below average for a mamodo, and he relies on his partner Mir for directions in battle.
Mir (ミール Miru) is a mysterious woman who works under Clear Note as Gorm's partner. She is notable for her comically large powder-puff hairstyle and her penchant for making funny faces. She often projects a snotty and annoying demeanor but is actually extremely afraid of Clear's power. She has deep scars on her shoulders and back, which are implied to have been inflicted by Clear.
Not much is known about Gorm or Mir compared to many of the other characters. Gorm is said by Clear to have been a loner in the Mamodo World, with no friends and family. Mir was shown on a volume cover page to have been part of a rich circle (very possibly a mafia gang) before being kidnapped by Gorm to become his partner. It is likely that she lived in Milan, like Parco Folgore.
The Mamodo Battle
Caring only about himself at this point, Gorm met Clear sometime after Clear and Ashuron's first battle, and propositioned to lend the evil Mamodo his power in return for being the only one left alive once Clear had used his King's Privilege power to wipe out all other Mamodo (and killed himself afterward). Clear accepted, and the two began traveling together.
Gorm and Mir are first seen in the plot when the King Festival begins. Gorm appears outside of Ellie's house and quickly warps into Ellie's room. The girl and her Mamodo escape, Arth stating that, despite his vast knowledge of Mamodo, he has never heard of one with Gorm's power. Gorm follows the pair, who try to attack him, but are stopped by Mir, who reveals herself and destroys the team's spell with Baakureido Dioborosu. After a brief battle, Arth and his partner try to escape again but are pursued once more. It is here where they unleash their ultimate spell, which is defeated by Gorm's own, which also burns Arth's book. Believing Ellie to be dead (though she survived), they leave the scene.
The team appears again shortly after, warping in front of the house where Brago and Sherry are staying to battle them. However, this time is different than the last, since their master has come with them. Mir tells Clear to let them handle the battle, but Clear looks at Mir in such a menacing way that it reduces her to breathlessness immediately. Clear then begins to fight Brago. They stay out of the way until the arrival of Ashuron (along with Zatch Bell and Kiyo Takamine), who immediately targets Gorm. Clear manages to save them, and tells them to flee, as they are no match for the dragon Mamodo. After Ashuron impales Clear with his horn, Clear yells for Gorm, who warps back onto the battlefield and quickly retrieves his master, taking him into the "Black Room" (黒い部屋 Kuroi Heya or ブラック・ルーム Burakku Rūmu) dimension so he can regenerate into a new form, which will take ten months. Ashuron tries to sway Gorm by remarking to him that watching Zatch battle is more interesting than watching Clear, but the Mamodo does not understand. Mir ponders hiding Clear somewhere and coming back to finish the two remaining pairs off, but changes her mind when she sees military helicopters approaching. As they leave, she tells their enemies that they will not be so lucky next time.
Gorm is next seen seven months later, sitting beside Clear as he regenerates in Gorm's dimension. Awhile later, Gorm takes a sleeping, cocooned Clear out of the dimension without his knowledge and hides him in a cave. He then warps to Milan, where Mir and Vino, Clear's partner, are eating at a cafe. Mir is angry at him for taking Clear out of the Black Room, but Vino assures her it'll be alright, so Gorm and his partner go looking for mamodo in order to relieve Gorm's restlessness.
They find Purio, and begin chasing after him. His partner, Lupa, tries to come to his rescue but fails. Luckily, Kanchome and Folgore, who Purio had made friends with earlier, arrive and overpower the evil team. Kanchome uses his most powerful spell, Shin Poruku, and, despite Gorm's warping abilities, decisively wins the battle. However, Kanchome, who had always been the weakest among his friends, begins abusing his recently acquired power and nearly kills the pair (who are unaware that the spell is just a powerful illusion). Folgore then steps in and talks Kanchome out of continuing. They cast the spell again to create a much more pleasant environment, which makes Gorm happy. Kanchome gives the mamodo a flat stone with a bird he drew on it and tells him they can be friends when they return to the Mamodo World. Mir chastises the overjoyed Gorm, and Folgore cancels the spell so they can burn the pair's book peacefully.
However, Vino is watching, and he casts a spell that results in the burning of both Kanchome's and Purio's books. While this happens, Gorm sits nearby and stares at the stone. He stares at it even after he and Clear are back in the Black Room, and then asks Clear if Kanchome could possibly be spared from the annihilation of all mamodos when Clear becomes king. Clear vehemently refuses, and Gorm asks to leave the Black Room again. He visits Mir in Greece, her new hiding place, and announces his intention to oppose Clear. Mir begins yelling at him, telling him that "that duck" is not important, and that they wouldn't be able to beat Zatch and Brago even if they did beat Clear. The scars on her back are shown for the first time as she explains that it is always her who gets punished for Gorm's missteps and that the weak should follow the strong and say nothing.
Sometime later, Kiyo and Zatch are training in the mountains when Gorm comes out of a portal right in front of Kiyo—however, it is only his upper torso that emerges. Mir steps out behind the fatally wounded Gorm, who is still holding Kanchomé's gift, and reveals that she actually did fight against Clear with her Mamodo, and left Clear and Vino in the Rocky Mountains. She asks Zatch and Kiyo to burn Gorm's book so he will be healed in the Mamodo World and to bring both Gorm and Kanchome back to life if he becomes king. Zatch promises he will and complies with her first request. Mir, with her eyes hidden, thanked them and begins walking home as her Mamodo disappears.
Gorm's last appearance prior to the battle's end is as one of the many Mamodo who lends Zatch their power in the final clash against Clear Note, through the power of the Golden Spellbook.
After the Battle
A happy and healthy Gorm is seen in the Mamodo World, taking Kanchome and Purio to school.
When all the Mamodos who participated in the battle send letters to their partners, Mir is seen reading Gorm's with a sly smile on her face.
The Black Room
The "Black Room" (黒い部屋 Kuroi Heya or ブラック・ルーム Burakku Rūmu) is what Mir calls the dimension that Gorm warps through in order to get from place to place, and also the attribute of his spells, as evidenced by Mir saying she will show Arth and Elly its "profound horror" before casting Dioborosu Za Randamiito. For all intents and purposes, it is the name of the particles that Gorm emits out of his hands in order to make his portals, and it can be assumed that the same particles, or some form of them, make Gorm's spells.
Normally, Gorm merely makes a portal that he enters in one location and comes out of in any other location he can think of (it is presumed that he can't warp to the Mamodo World, but the exact limits of the Black Room were not stated), but if he needs to he can enter the Black Room dimension itself, which seems to be infinite and formless (though there is an invisible floor). He can store things in this dimension like he did with Clear during his regeneration period, but for an unknown reason, Gorm has to stay in the Black Room with him when he is there. Possible explanations for this are that Clear would be destroyed if Gorm left the dimension with him still in it, or that Gorm might not be able to control the location in the Black Room that he warps into when he goes there. In any case, whenever Gorm left the dimension he hid Clear in a place where he thought he'd be safe.