Viola

Viola (ビオーラ), also referred to as the Black Hood (黒フード) from the lips of Rimuru, was a powerful metallic Golem, a veritable handcrafted marvel and masterpiece, created and controlled by the Demon Lord Clayman. It was completely dismantled down to the smallest parts in the confrontation with Beretta.

Appearance
Viola represents an iron humanoid figure with a body cloaked beneath a long dark robe or mantle complete with a hood covering its head.

Viola's metallic body possesses a prominent light grey color of metallic. Its constituent parts are in great condition giving rise to a body without the appearance of being rusted or any other signs of metal corrosion. Due to its smooth surface and the bright color of the metal, with the right level of illumination, reflections can be seen.

To acquire a more manicured appearance which doesn't overtly expose the Golem's true structure, Viola sports a lengthy, dark colored hooded, short-sleeved cloak. It extends to the level of the knees.

Similar to its creator in combat form, Viola possesses a double pair of arms, allowing it to wield, control and even juggle various projectiles of energy and magic, as well as hold other weapons such as spears and swords, with great ease and efficiency. Each of its forearms is wrapped in some manner of bandages or tourniquets.

The head of Viola has an oval shape, with a protruding chin or mouth, and distinctive hexagonal eye sockets containing golden vision devices that serve as eyes. Also Viola's head has hollows on the each side imitating the ears, which are difficult to notice due to the permanently worn hood.

Personality
Viola exhibits no personality characteristics whatsoever. Although Clayman is genuinely and openly proud of his powerful engineering, Viola is not a subordinate of Clayman in the conventional sense, but rather a majestic weapon that tears enemies apart protecting its builder.

Background
In the days when the Curse Lord, the formidable and intimidating Lord Kazalim, reigned over Jistav, he devised numerous protective measures and protocols to preserve the ruined city of Amrita, which lies beneath the future Clayman's Castle. Kazalim, being an accomplished creator of weaponised Golems, had himself created an army of golems to safeguard the underground ruins. Clayman, who was preparing for his upcoming role as Demon Lord, inherited the technique of creating magic dolls from his mentor and master, eventually bringing his best work, Viola, to life.

Trivia

 * In the manga adaptation compared to the anime adaptation, Viola's body was more heavily covered in a robe and concealed by darkness.
 * It has been stated that Viola's body possesses a Unique Grade quality. From this, it can be surmised and interpreted that the metal that was used to sculpt its body is most probably Magisteel.
 * Viola's ability to hurl swords and spears, which similarly to its body possessed a Unique Quality, was not visualized in the anime adaptation.
 * After Ramiris and Beretta had moved to Tempest and established the Dungeon, Beretta finally had the opportunity to give the spoils of war to its summoner, originally intended as a reward in exchange for their relocation. Albeit Viola was teeming with a gigantic variety of Unique Grade weaponry, they turned out to be difficult-to-modify, rendering them useless for Ramiris' scientific studies. Most likely they had become prized and coveted bounties in the treasure chests of the Dungeon, or had been sold for a substantial fortune by Rimuru.
 * Clayman was delighted to demonstrate his man-made masterpiece on Walpurgis, and was immensely proud of his creation, however, although Viola was mightier than himself in terms of direct confrontation with the enemy, in comparison to the Golems defending the ruins of Amrita, it stood marginally better than the average.