Cusack

is one of the highest-ranked demon of the Demon Clan as well as Zeldris' former master. He and Chandler were once a single entity known as the "Original Demon".

Appearance
Cusack is a tall and very muscular man with red hair that has bangs extending to cover his right eye and end in a long ponytail braided. He also sports a very long mustache that reaches his pectoral section and a small goatee.

His demon mark consists of two black arrows extending below his left eye and a spot of darkness on his right shoulder that extends further around his arm.

His attire consists of a skin tight white vest shirt with no sleeves, black pants and high knee boots. On his forearms are detached sleeves.

Upon revealing his true form, Cusack grows much taller in stature and his arms grow longer and his hands become larger, enough to hold both his sword hilts in between his fingers. His hair and mustache also grow and turn white. The color of his eyes are inverted. He also grows dragon-like wings from his shoulders. His demon mark is larger that extends down his cheek with the arrows converging together and a mark grows on his chest forming a cross.

Personality
Cusack is very confident in his abilities, requesting Zeldris' permission to exterminate the Seven Deadly Sins, former Fairy King Gloxinia, and former Giant King Drole all by himself.

Like Chandler's attachment to Meliodas, Cusack is very much attached to his student, Zeldris, expressing the utmost confidence and loyalty to the Demon King's second son. This extends to the point that he believes Zeldris to be worthy of reigning the Demon Clan next instead of Meliodas. This attachment led him to express complete anguish and shame along with rage when he ranted about how he failed to protect Zeldris when Meliodas pinned him down upon his arrival to Camelot.

Despite being a loyal vassal of the Demon Clan, Cusack is shown to be quite critical towards some of them as he outright called the Demon King being too compassionate with Meliodas in spite of his betrayal. He also denounces Chandler as being incompetent when he and Meliodas returned to Camelot with Elizabeth still alive despite it being Meliodas' orders.

In battles, he swiftly brings down opponents as efficiently as possible as shown with Cath but will toy with them should he be bored enough and also if he is curious about them. He is also rather patronizing towards them if he notices distinct flaws about them as he lectured Arthur Pendragon on why he failed to win the battle like intended.

Cusack is shown to be proud of his mustache, claiming it as the number one mustache in the Demon Realm and was even shocked after realizing half of it was cut off in a fight with Arthur Pendragon, the only real damage he had done.

History
Cusack, along with Chandler, were once a single entity known as the "Original Demon" who was created by the Demon King as his most trusted retainer. Acknowledging his own immense power, the demon rebelled against the Demon King only to be dealt with and punished. For rebelling against the Demon King, the "Original Demon" had it's body and soul split in two, and was tasked with the duty of being instructors to the two demon princes to become candidates for the throne of the Demon King.

Long before the Holy War, Cusack trained Zeldris, the second son of the Demon King in combat.

Cusack rarely fought during the war 3,000 years ago. Eventually he along with the rest of the Demon Clan were sealed away within the Coffin of Eternal Darkness by the allied clans (Goddess, Giant, Fairy, and Humans).

New Holy War arc


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Abilities and Equipment
As Zeldris' former master and the highest-ranked demon, Cusack is extremely powerful. Zeldris states that along with Chandler, he is more than enough to fill in the nine vacant spots of the legendary Ten Commandments. According to Arthur Pendragon, his power rivals that of Zeldris'. His aura is so powerful that it completely terrifies the human souls inside Excalibur. Merlin states that Cusack is a monster whose power far surpasses the Ten Commandments, and alongside Chandler, he is the oldest and strongest demon in the Demon Realm excluding the Demon King himself. Even Zeldris acknowledges that Cusack is stronger than him, with Cusack himself stating that Zeldris will one day surpass him. As the person who taught Zeldris how to wield a sword, Cusack possesses unmatched skill with a sword, being able to easily damage Ludociel in a fight with his blades.

Like all members of the Demon Clan, Cusack is able to manipulate the mysterious jet-black power of darkness for a variety of purposes, such as forming wings for flight and regeneration.

Cusack possesses immense levels of endurance, as shown when he remains mostly unfazed from having been pierced through the abdomen by Meliodas’ darkness in his Assault Mode, though he was immobilized until the former recalled it back. He also possesses immense physical strength, being able to completely shatter a stone wall with a single grip and easily breaks free from Merlin's Icicle Castle just by moving.

In his true form, Cusack is more powerful than ever. He has shown the ability to shoot energy beams from his eyes that can cause massive damage. He is capable of fighting Ludociel, leader of the Four Archangels, even gaining the upper hand. In this form, Cusack possesses immense levels of durabilty as he remains completely unscathed after being hit at point-blank range by Merlin's Double Impact spell and Ludociel's Grace. Even after taking a powerful Ark imbued jab from Ludociel, Cusack remains unharmed. He also possesses immense speed and reflexes, as shown when he moves in between Zeldris and Ludociel in an instant to stop the latters attack, and is able to keep up with and outpace the speed of Ludociel's Flash.

Despite having his original magic power sealed, excluding the Demon King, Cusack is celebrated amongst the Demon Clan as the absolute strongest demon who is strong without equal, fast without compare, and tougher than any other.

Abilities

 * This ability allows Cusack to link with someone through eyesight. When activated, his eye and the eye of his target glow the same color and the person does the same movements as Cusack. Due to his use of this technique, Cusack gained the moniker "Napping Reaper".

Weapons

 * Dual Sword Hilts: Cusack carries two identical sword hilts on both sides of his hips, which he channels his darkness through to create two blades.

Power Level
Cusack's power level in his True Form are as follows:

Zeldris
Cusack strives to impress Zeldris in any sort of way and admires him, calling him the most worthy of being the Demon King. He is also envious when Zeldris praises someone else as he said that if his love for Zeldris was on the line then he would not lose to anyone. While not conducting any missions, Cusack is shown to attend to Zeldris like a butler and is shown to be comically wounded when he denounces his tea and advice as terrible. He also displays complete rage when Meliodas brought Zeldris down with his darkness and was ready to attack Meliodas for it, and he shows great respect toward him and belives that Zeldris will be the one to surpass him.

Later upon planning to merge the Ten Commandments with Zeldris,Cusack reveals that he truly and genuinely loves and cares for Zeldris as something akin to his own son and later stated that he does not care weather these feelings were simply implanted in him by the Demon King when he was created and instead simply focuses on insuring Zeldris's ascension as the new Monarch of the Demon Realm,further showing his single minded devotion and loyalty to Zeldris.

Chandler
Cusack seems to get along well with Chandler as they talk and walk casually together. However, Cusack does seem to get annoyed at Chandler whenever Meliodas is mentioned, as it upsets the latter and he becomes a cry baby and obsesses over Meliodas. He and Chandler were once a single entity known as the "Original Demon".

Later despite Chandler being his "other half", Cusack has no hesitation in killing him in order to secure the Commandments for Zeldris. Showing that his loyalty to his charge far surpassed his care for his "other half".

Prelude to the New Holy War arc

 * Arthur Pendragon vs. Meliodas, Zeldris, Cusack & Chandler: Win

New Holy War arc

 * Assault Force vs. Zeldris, Chandler & Cusack: Loss

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