Demolt (デモルト, Demoruto) and Roberto Vile (ローベルト・ヴァイル, Rōberuto Vairu) are the final Ancient Mamodo/human team that Zatch, Kiyo and their friends face. Demolt is the last and most powerful of the Four Supreme Mamodo from a thousand years ago, and was nicknamed the "Crazed Warrior Berserker" because of his massive size and power. His spell powers revolve around the claws on his hands, one of his spells allows him to use them as a handheld weapon.
Demolt is a large, intimidating mamodo characterized by his demonic physique and beast-like features. He possesses massive, curved horns resembling those of a ram, metallic shoulder guards, and weapon-like arm extensions known as “arm horns” or simply "horns" in the Konjiki no Gash!! Marukajiri Book 2. These arm horns resemble broad, serrated blades, enhancing both his defense and offense in close combat. Demolt’s skin is a dark crimson tone, while his wings are black on the outer surface and red on the inner membranes. His upper body is heavily muscled, with deeply defined pectorals. His lower body is covered in black fur, ending in clawed, beast-like feet, while a spiked tail extends from his back. His wide, fanged mouth and deep-set eyes give him a feral, menacing expression.
Roberto is a tall, sinister-looking man with long black hair slicked straight back, sharp facial features, and a prominent square nose. He wears a dark navy coat adorned with gold buttons and trim, which extends nearly to his ankles and gives him a militaristic, imposing presence. Beneath it, he wears a high-collared white shirt with a cravat and striped gray trousers. His pale grayish complexion, combined with his angular features and dark attire, lends him a ghastly, almost corpse-like appearance that heightens his menacing aura.
Personality[]
Demolt is a ferocious and battle-obsessed warrior, often described as a “berserker” by both allies and enemies alike. In combat, he behaves more like a wild beast than a sentient mamodo—roaring instead of speaking, pounding his chest like a gorilla, and charging headlong into battle with reckless abandon. His ferocity embodies the purest form of instinct-driven combat, overwhelming opponents with brute strength and unrelenting aggression. Despite his savagery, Demolt is not inherently evil. His violence appears rooted more in a lust for battle than in cruelty or malice, similar to warriors like Tsao-lon. According to Laila, “once he becomes violent, he loses sight of what’s around him,” highlighting his tendency to fall completely into his fighting instincts. However, in the present era, this weakness seems to have diminished through his partnership with Roberto, whose influence made him “many times stronger” and more focused in combat. Demolt shows occasional glimpses of discipline and loyalty, particularly in how he obeys Roberto’s commands without resistance, even when ordered not to “play around.” He fulfills his duties, such as protecting the Moon Stone, with surprising seriousness. In his final appearance, he is even seen calmly participating in construction work in the Demon World, suggesting that beneath his monstrous exterior lies a stoic and dutiful nature capable of restraint once his rage subsides.
Roberto is sadistic, calculating, and cruel, deriving pleasure from the suffering and manipulation of others. Unlike most of Zofis’ human partners, his mind is not under his control; he willingly serves him out of personal amusement and ambition. He views the chaos unleashed by Zofis’ army as a grand spectacle, stating that “monster hunting is incredibly entertaining.” Roberto exhibits a twisted sense of curiosity and power, using the Moon Stone to hypnotize innocent people and force them to commit evil acts, not out of necessity but for his own enjoyment. His demeanor is cold and arrogant, but when his ambitions crumble—particularly after the Moon Stone’s destruction—he shows cowardice and despair, even weeping and recklessly activating a forbidden spell that ultimately leads to his downfall. Despite his manipulative and malicious tendencies, Roberto is not entirely one-dimensional. His obsession with achieving “something big” through the Moon Stone reveals an insecure man haunted by past mediocrity, desperate to feel purpose or significance. In the end, this misguided desire leads him to be consumed—both figuratively and literally—by Demolt, the very monster he sought to control.
Biography[]
Background[]
Demolt's stone tablet
Demolt participated in the previous battle 1,000 years ago to decide the Mamodo King. At some point during the battle, Demolt was turned into a stone tablet when Goren of the Stone used his spell, Dioga Gorugojio.
Part I[]
Demolt, after having his true self awakened, becomes annoyed with his bookkeeper and swallows him becoming more powerful. Zatch, Kiyo and his friends eventually use teamwork of their strongest and most helpful spells, Kiyo brings out Zatch's new spell, Zaguruzemu his other spell, Baou Zakeruga, which with combination of Laila’s Miberna Ma Migron, defeats him, and Wonrei hits Demolt with Rao Diboren, which burns Demolt's book. Fearful for his life, the agitated Vile runs away shortly afterward.
While being controlled by Zofis, Demolt is the guardian of the Moonlight stone, which let Zofis control human minds. During the fight, Penny helps the team to defeat him and destroy the Moonlight stone with her So Giaku spell, but her spellbook is also burned in the process.
After the battle with Clear, Demolt is seen having a happy life in the Mamodo World.
Description: Gives Demolt powerful armor on major parts of his body. It also released Demolt from Zofis' complete control, leading to him turning on Vile. However, it's likely that under normal circumstances he would have entered a berserker state.
