Estarro

Estarro is one of the highest-ranked demons of the Demon Clan as well as Sirius' former master. He and Calypto were once a single entity known as the "First Sinner".

Appearance
Estarro is a tall and very muscular man with slicked back scarlet hair that ends in a long, braided ponytail. He also sports a large goatee, with a shaved down beard.

His Demonic Seal consists of a v-shaped patch of darkness over his left eye, with a diamond in the crook of the V.

His attire consists of a white, sleeveless vest, with black pants and gray boots. He also wears two detached, dark gray sleeves, spanning from his elbow to his knuckles.

Upon revealing his true form, Estarro grows much taller in stature, and sprouts a second pair of arms, emerging from his armpits.

Personality
Estarro is very confident in his abilities, with him being able to fend off both Estot and Sauriel at the same time.

Like Calypto's attachment to Elderos, Estarro was very much attached to his student, Sirius, expressing the utmost confidence and loyalty to the Demon King's first son. This extends to the point that he believes Sirius to be worthy of ruling the Demon Race next instead of Elderos. This attachment led him to express complete anguish and shame along with rage when he ranted about how he failed to protect Sirius, blaming Kilimiester and Gambion for his betrayal.

Despite being a loyal vassal of the Demon Race, Estarro is shown to be quite critical towards some of them as he outright called the Demon King being too compassionate with Kilimiester in spite of his betrayal.

In battles, he swiftly brings down opponents as efficiently as possible, 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.

Estarro is shown to be proud of his mustache, claiming it took years and years to make perfect.

History
Estarro, along with Calypso, were once a single entity known as the "First Sinner" who was the founder of the demon race, and resurrected by the current Demon King, Abraxes. Acknowledging their immense power, the Demon King, in fear of them rebelling and destroying him, split their body and mind in two, forming the new demons, Estarro and Calypto.

Abilities and Equipment
As Sirius' former master and one of the highest-ranked demons, Estarro is extremely powerful. Sirius states that along with Calypto, he is more than enough to fill in the for Purgatory, possessing even more power combined than every Commandment. According to Sirius, his power rivals that of both Mael and Alzareth. His aura is so powerful that it completely terrifies even the strongest men. Merlin states that Estarro is a monster whose power far surpasses the rest of The Pillars, and alongside Calypto, he is the oldest and strongest demon in the Realm. Even Mael acknowledges that Estarro is stronger than him, with Estarro himself stating that Sirius will one day surpass him in raw strength. As the person who taught Sirius how to wield a sword, Estarro possesses unmatched skill with a sword, being able to easily damage even Ateus in a fight with his blades.

Like all members of the Demon Clan, Estarro is able to manipulate the mysterious jet-black power of Void Energy for a variety of purposes, such as forming weapons and regeneration.

Estarro possesses immense levels of endurance, along with seemingly bottomless stamina reserves. He also possesses immense physical strength, being able to completely shatter a wall with a single punch.

In his true form, Estarro is more powerful than ever. In this form, Estarro possesses immense levels of durability as he remains completely unscathed after being hit by a combo attack from each and every Ironclad. He also possesses insane speed and reflexes, and is able to keep up with and outpace the speed of Ateus' Star Link.

Abilities

 * Overpower: This ability allows Estarro to simply look at an enemy, and immediately put them in a state of horror, due to his overwhelming presence.

Power Level
Estarro's power level is as follows: