Testarossa

Testarossa, also known as Blanc (原初の白 Shiro, lit. "Primordial White"), is one of the seven Primordial Demons and the progenitor of the White lineage. Known for her overwhelming magical power, intelligence, and elegance, she is regarded as one of the strongest demons in existence.

Long before serving Rimuru Tempest, Testarossa gained notoriety for causing the infamous "Lake Shore Dyed Scarlet Incident", an event that demonstrated her immense destructive capabilities. Following Diablo's invitation, she accepted Rimuru's summons alongside Ultima and Carrera, becoming one of Tempest's most powerful subordinates. After receiving a name from Rimuru, her abilities evolved even further, and she later became one of the executives of the Jura Tempest Federation, carrying out diplomacy and military affairs with exceptional efficiency.