Tanaka is the house steward and a former butler of the Phantomhive household. Tanaka is an elderly man with gray hair and a mustache. He wears a monocle, a black suit, and white gloves, and he is often holding a cup of tea. Tanaka's body dimensions are generally portrayed shorter, smaller, and in less detail than they are in actuality. In dire situations, he is depicted at his full height. Tanaka is a perceptive, dignified individual whose loyalty to the Phantomhive house and its head is unwavering. He previously served Vincent Phantomhive as a butler; however, after sustaining severe injuries on Ciel's tenth birthday, he presently does a limited amount of work. Nevertheless, when needed to substitute Sebastian Michaelis as the butler, he performs his duties efficiently and without delay. He has a wealth of experience at his disposal and thus is a dependable adviser to the head of the Phantomhive house. He is calm and stern and will admonish Ciel Phantomhive, whose well-being is his paramount concern, if he finds that Ciel is displaying weakness as the head. Despite his age, Tanaka remains an exemplary fighter; he once, via Baritsu, effortlessly subdued a man who attempted to harm Ciel. He is exceptionally skilled in wielding a katana, having sliced a bullet in two with it.

Black Butler
Young Ciel Phantomhive is known as "the Queen's Guard Dog," taking care of the many unsettling events that occur in Victorian England for Her Majesty. Aided by Sebastian Michaelis, his loyal butler with seemingly inhuman abilities, Ciel uses whatever means necessary to get the job done. But is there more to this black-clad butler than meets the eye? In Ciel's past lies a secret tragedy that enveloped him in perennial darkness—during one of his bleakest moments, he formed a contract with Sebastian, a demon, bargaining his soul in exchange for vengeance upon those who wronged him. Today, not only is Sebastian one hell of a butler, but he is also the perfect servant to carry out his master's orders—all the while anticipating the delicious meal he will eventually make of Ciel's soul. As the two work to unravel the mystery behind Ciel's chain of misfortunes, a bond forms between them that neither heaven nor hell can tear apart.