Beretta

Beretta is a powerful guardian character in the anime That Time I Got Reincarnated as a Slime (Tensura), primarily serving as the loyal bodyguard and protector of the fairy queen Ramiris.

In the anime's depiction, Beretta originates as a Greater Demon (from the lineage associated with Diablo/Noir) that Rimuru Tempest summons and names. Rimuru places this demon into a specially crafted golem body made of high-quality materials like demon steel, resulting in Beretta evolving into an advanced form known as an Arch Doll (or similar high-tier magical construct). This process transforms Beretta into an exceptionally strong subordinate, far beyond a typical demon or golem.

Beretta has a tall, imposing, armored appearance with a metallic, mechanical look—often featuring a mask/helmet covering the face, long hair visible in some scenes, and a generally androgynous yet feminine-presenting design in the anime (enhanced by a female voice actress, reflecting the creator's preference for the adaptation). Beretta speaks in a calm, composed, and formal manner, showing loyalty to Ramiris (as primary master) while maintaining respect and secondary allegiance to Rimuru.

Personality-wise, Beretta is rational, dutiful, and unusually intellectual for a demon—interested in knowledge and research rather than pure destruction. Beretta plays a key role in protecting Ramiris's labyrinth and contributes to major events, such as battles tied to Tempest's alliances and conflicts (e.g., around the Walpurgis arc and labyrinth defense). Overall, Beretta stands out as one of Rimuru's most reliably overpowered creations, blending demonic power with golem durability.