Arios Orlando

Arios is the one of the two main antagonist of the series along with the current reigning Demon Lord. He is the former hero who kicked out Rein Shroud of the Hero's Party due to his hatred towards him. However, after his second defeat by Rein, he was stripped from his title as a hero and gotten completely written off as a traitor as well he was imprisoned by humanity for his actions, causing the disbandment of the Hero's Party due to his delusions and betrayal in his failed-yet-weakly attempted to kill Rein.

He later escaped out of prison with help from Monica (a subordinate of the Demon Lord) where he join the Demon Lord's army for his vengeance upon Rein, his companions the former Heroes and humanity (who now considered Arios as a traitor) due to him being completely humiliated by Rein. He is the archenemy of Rein Shroud.

Personality
Arios is an ignorant and delusional imbecile who refused to learn from his mistakes. He is selfish when he only cares is himself and has no concern for Lin, Mina and Argus because he only viewed them as his disposable pawns rather than his "friends". He is also incompetent when he and his soon-to-be former fellow heroes in a complete disadvantage against the demon lord's army because Rein was a pillar to the Hero Party (which they would've defeated the Demon Lord) while Arios is a liability (when he and his former future teammates failed at everything as they were unable to defeat the Demon Lord's army). After his defeat by Rein, Arios drove into his insanity when he desires to get revenge on Rein and wanted to kill him for the humiliation Rein and his companions did to him as far as he betrayed the Hero's Party and his ancestor, the First Hero's legacy to defeat the Demon Lord just for his ridiculous accord but only to be defeated by Rein.

He is cunning and manipulative when he manipulates Edgar Fromware to join him due to them having a common enemy who they despised, Rein. He only viewed Edgar to be his pawn in his disposable. However. this lead to both Arios and Edgar's defeats by Rein and his companions, as well for Arios to lose his status as the "Hero" and has been sentenced to prison for both the crimes he committed against humanity and betrayal towards the Hero's Party and the legacy of his ancestor, the First Hero as far as Arios will always be remembered as a selfish, deluded traitor. While in prison, Arios was driven into even more hypocrite and insanity, where he became a completely unredeemable and unrepentant villain.

In Volume 8, after he escaped from prison as well lost his status as a "Hero" from his second ease defeated by Rein again, Arios became a complete sociopathic and deluded lunatic who was driven into an even more hypocrisy than he was before due to his own blinded hatred towards Rein gotten the better of Arios when Rein has ruined his reputation as a "Hero" and humiliated him. as well as for Arios to be completely written him off as a self-deluded traitor by humanity. For being completely insane and delusional, Arios wants to kill not only Rein, his party and the former Heroes party who now recognized Arios as a traitor, but also humanity itself by working for the Demon Lord (the ruler of the demons who Arios was chosen to defeat) shown that Arios has became a vile and filthy misanthrope when he has no remorse or sheds of humanity left inside of him. He is more deluded and persistent when he still believed he will kill Rein. He tries to sabotage Rein's A-Rank promotion exams, only to fail.

Abilities
Even though his personality is too wicked, he still have some abilities of being a former hero. However, his abilities are too weak against Rein (who gained power by making contracts with Demi-Humans from the strongest tribes).
 * Expert Swordsman: Since he is a fomer hero, he knows how to swing the sword properly. According to Rein, he is a master of sword.

Magic

 * Gigabolt : A lightning strike magic.