The devil is a tall humanoid with a pair of black, bat-like wings, black horns, clawed hands, and a long, arrow-tipped tail. His pale skin is mostly covered by a black coating and black lines and wrinkles. His teeth are pointed and black, and his irises are red.
Without a body, the devil appears as a dark-colored cloud of gas with eyes and a mouth.
This devil is a wicked and cruel individual. He looked down on both humans and elves, seeing them as his play things and a means to an end. He is shown to be extremely sadistic as he found joy in the despair of others, such as orchestrating the Elves' destruction and revealing himself to Patolli as the mastermind behind it.
This sadistic side also exposed a great amount of arrogance, such as how he mockingly revealed everything to Patolli and revealing his plans to the first Magic Emperor, believing nothing could ever defeat or stop him.
The devil's actions came from a deep desire for a body just so he can properly manifest himself and unleash chaos wherever he goes. This displays an extremely selfish side as the devil didn't care what methods he had to use in order to achieve that goal.
All these aspects accumulate to him lacking any morality on how little he thought of his actions toward humans and elves alike.
This proved to be his own undoing as he constantly underestimated his opponents which ultimately leads to his demise. In his final moments, the devil expressed shock at the comprehension that he was defeated.
The devil possesses a Clover Kingdom minister and orchestrates the royals' plot to steal the Elf Tribe's magic. He sets up a trap to keep Lemiel Silvamillion Clover from attending the wedding. After the massacre, Licht's despair turns his grimoire into a five-leaf clover. The devil attempts to take over Licht's body, but Lemiel's arrival rouses Licht, who then uses the magic stones to transform into a giant demon, refusing to surrender his body to the devil. The devil watches with amusement as Lemiel fights and kills Licht.
Afterward, the devil tries to steal Licht's grimoire, but Secre Swallowtail uses the magic stones to seal him within an Eternal Prison. Before the seal finishes, the devil summons the magic stones to himself and uses them to suspend the elves' souls and to set them and himself to reincarnate in the future.
Five centuries later, Patolli uses the magic stones and the tree of life monument to reincarnate the elves and, unknowingly, the devil. The devil possesses Baval and enters the Shadow Palace once it is opened. He then switches to Ronne's body and joins Patolli and Rhya in waiting for the arrival of Yuno and the eleventh magic stone. The devil manages to steal the stone from Yuno, and when Rhya grows suspicious of Ronne, the devil blasts a hole in Rhya's abdomen.
While Patolli is preoccupied with healing Rhya, the devil places the stone in the pedestal and summons his original body from the underworld. He then reveals the truth about the massacre and the elves' reincarnation, but Patolli refuses to believe it and lashes out with swords of light. The devil sends the attack back, and Yuno pulls Patolli and Rhya out of harm's way. Yuno tries attacking the devil himself, but the devil effortlessly block the attack and boasts about his Kotodama Magic.
The devil chooses to ignore Asta and Mimosa Vermillion when they drop into the chamber. Instead, he summons Patolli to him and begins torturing the elf. Yuno and Asta try to interfere, but the devil summons a storm of swords to distract the pair and then calls down a wall to smash them into the floor. The devil returns his attention to Patolli and forces the elf to face the truth that Patolli was following the devil's plan, not Licht's. The devil laughs at Patolli's anguish. Refusing to give up, Yuno and Asta stand back up and attack the devil together, cracking the devil's arm. The devil heals his arm and compliments the boys' for injuring him. The devil does not recognize Asta's devil but offers to let it keep Asta's grimoire.
While he waits for Patolli's grimoire to be corrupted into a five-leaf clover, the devil reveals his plan to take the grimoire to the living world and unleash his true power and form. The devil grabs the grimoire, and when Asta and Yuno try to stop him, he releases Patolli who has become a dark elf. The devil flies away toward the palace's exit while the boys are busy fighting Patolli.
The devil reaches the topmost chamber and is confronted by Licht. The two exchange spells until the devil creates bindings that restrain Licht and his sword. The devil throws a large spear at the bound elf, but Charla manages to redirect the spear to miss and Yami Sukehiro cuts the bindings. The devil renews his attacks and, after Yami cuts off the devil's arm and wing, compliments Yami and Charla's coordination. They continue fighting, and when the devil dodges one of Yami's attacks, Licht absorbs and releases the attack and manages to sever the devil's tail. The devil then uses the grimoire to summon a flood of magic from the underworld. The magic eats other magic and lifeforce, and the devil directs it to flood down and swallow everyone in the Shadow Palace.
Asta, Yuno, and Patolli reach the chamber, and the devil is impressed that they reversed the dark elf transformation. Suddenly Lemiel and Secre crash into the chamber and confront the devil.
- Reincarnation Magic: The devil uses this form of magic to revive souls of the dead in bodies of the living.
- Immense Magic Power: The devil possesses an immense amount of mana, more than even the most powerful elves.
- Possession: The devil is capable of possessing the bodies of others, including elves and humans.
- Grimoire: The devil possesses a five-leaf clover grimoire that augments his Kotodama Magic. It used to be a four-leaf clover grimoire that belonged to Patolli, before being corrupted by the devil.
- "Both you elves and humans... Your dreams and desires all make for the ultimate playthings...!!" 「エルフも... 人間も... アナタ達の夢や欲望はサイコォォォの
玩具ですよ...!! "Erufu mo... Ningen mo... Anata-tachi no yume ya yokubō wa saiko~o~o~o no omochadesu yo...!!"」