Agni

Soma's butler (Agni). Born on August 24, 1858. A key figure in the "Upside-Down Murder Case" arc. Always a gentle and calm young man. He swears absolute loyalty to Soma, who grows up without any inconvenience and behaves freely, and visits England with him in search of Mina. His catchphrase in response to his master Soma's orders is "As you wish (Yes, my lord)." As a butler, his abilities are high, and he provides precise guidance to the Phantomhive household's servant trio, showing his caliber is on par with Sebastian. Moreover, through self-hypnosis (Samadhi) driven by his devotion to Soma, he can strengthen himself, displaying exceptional physical abilities enough to compete on equal terms with Sebastian, who is a demon, in a fencing match. He possesses the "Right Hand of God (The Right Hand of Curry)," which creates miraculous curry from hundreds of spices with the best blend.

His real name is Arshad Satyendra Iyer, born into the priestly class (Brahmin). He has a background of being sentenced to death for blasphemy and wickedness due to his fallen father and his own disbelief in God, but was saved by Soma just before his execution. Since then, he has adored Soma as a "god" and held the above-mentioned absolute loyalty.

He is the culprit in the "Upside-Down Murder Case" arc, secretly siding with Harold to prevent Soma from learning about Mina's true nature, following his plan. Later, he competes with Sebastian in a curry contest, where their skills are deemed equal, but he is defeated by Victoria's judgment. Since then, he has become one of the few human friends of Sebastian.

In the "Blue Cult Arc," he fights to protect Soma from an attacker who raided their mansion, ensuring Soma's safety while he himself is slashed all over his body with blades and dies. He passed away on November 15, 1889. His way of life was praised by Sebastian as a model butler.