Diablo

Diablo, formerly known as Noir (原初の黒 Kokushi, lit. "Primordial Black"), is one of the Seven Primordial Demons and the progenitor of the Black lineage. Among the Primordials, he is regarded as one of the most powerful and possesses unparalleled intelligence, composure, and magical ability.

Before meeting Rimuru Tempest, Diablo wandered the world in search of someone worthy of his loyalty. After being summoned by Rimuru during the Kingdom of Falmuth invasion, he immediately pledged his absolute devotion and was given the name Diablo, allowing him to evolve into a Demon Peer. From that point onward, he became Rimuru's most trusted subordinate, carrying out diplomatic missions, intelligence operations, and military campaigns on behalf of the Jura Tempest Federation.

Despite his calm and courteous demeanor, Diablo is utterly ruthless toward anyone who threatens Rimuru or Tempest. His unwavering loyalty, overwhelming combat prowess, and strategic mind make him one of the strongest and most dependable members of Rimuru's forces.