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Undertaker (葬儀屋, Andāteikā) is a seceded Grim Reaper. He is also a former Aristocrat of Evil and informant to the Phantomhive house, since Vincent Phantomhive's time. He used to work as a funeral director for normal society.
Undertaker is a seemingly young, lean man, with long gray hair and a single braid on his right side. Like other Grim Reapers, he has chartreuse phosphorescent eyes.
Undertaker has extensive black fingernails and a noticeable scar across his face, neck, and left pinky finger. His robe is predominantly black; additionally, his attire includes an incredibly long top hat, and a gray scarf strapped across his chest and knotted by the hips. He wears an emerald ring on his left index finger; he wears a band of prayer beads around his neck, and he formerly wore a chain with six mourning lockets around his hip. The attire he wears was the typical attire for Victorian England funeral mutes.
When Undertaker was still active as Grim Reaper, he wore a pair of half-framed silver-square glasses, a black trench coat, a white dress shirt, a black tie and a pair of black gloves and shoes. He did not have any scars on his face and neck, but he did have his ear piercings.
Undertaker's silver Death Scythe is longer than himself, and it has a long curved blade, looking like it grew out of the skull at the top end of the handle. A miniature skeleton adorns the scythe, which consists of the skull and a rib cage wrapped in a thorny vine. The spine of the skeleton turns into the scythes long handle, which ends in a lower backbone.
Known only by his profession, Undertaker is a mysterious man whose scarred face is rarely fully visible beneath his long hair and crooked top hat. He tends to punctuate his words with sweeping gestures and creepy giggles, and he spends a considerable deal of time inside of coffins. He takes joy in frightening others, as he intentionally acts disconcertingly to provoke a reaction. Undertaker frequently refers to the deceased as his "guests," and it is his hobby to remove organs from his "guests" for research.
Undertaker has great and significant connections with the underworld societies because murder victims from the underworld are often delivered to his place of business. Thus, he has voluminous knowledge in these macabre cases that allows him to be an informant. However, he does not exchange his services for "the Queen's money," as he dislikes Queen Victoria. Instead, he expects those that want information from him to amuse him in some way.
Undertaker is intrigued by humans, to the degree that he defied the Grim Reaper conduct out of his own volition so that he can manipulate the fundamental notions of life. He is exceptionally disenchanted by the aspect of death (which is considered to be the "end"); one day he started asking the question: "What would happen if the end had a continuation?".  For this question to be answered, he connects fake records to individuals' Cinematic Records. However, despite his many experiments, he could never successfully construct a soul, thus originating Bizarre Dolls, whom of which are nothing more than "flesh dolls without a self." Nonetheless, he is proud of his creations, and even when others remark on his deranged nature, he refuses to concede, and stresses the beauty of his Bizarre Dolls.
Undertaker regards a particular chain of lockets as his "treasure." (On one locket, there is a date and a name engraved: 13 July 1866, Cloudia P.) He eventually entrusts his treasure in Ciel Phantomhive's care.
Undertaker is a retired Grim Reaper, and as Grell Sutcliff and Ronald Knox claim, a "deserter." He had served as a Grim Reaper for a long time, repeatedly reaping souls in a relatively peaceful, indifferent fashion until he grew tired of the mundane process and began to experiment and tamper with human life.
Sometime later, Undertaker established his funeral parlor and became acquainted with Vincent Phantomhive. His intermittent business relations with the said Earl earned him the status as one of the "Aristocrats of Evil".
Red Butler Arc
When Ciel Phantomhive, Sebastian Michaelis, Lau, Angelina Dalles, and Grell Sutcliff enter his funeral parlor, Undertaker appears out of a coffin, saying he had expected Ciel to come. He invites his visitors to sit on the coffins and distributes tea to them. He guesses correctly that Ciel wishes to gain additional knowledge about the Jack the Ripper case.
Undertaker informs them that there is a certain commonality among all the murdered prostitutes, but he demands compensation before he will reveal the crucial detail. When Lau asks him how much money he wants, Undertaker vigorously approaches him and tells him that he does not care for Queen Victoria's money. He states that he only has one requirement: show him a "first-rate laugh"—in other words, make him laugh hysterically, which is a common trait that he holds dear.
Subsequently, Lau fails to elicit a laugh with his joke, and Angelina's vulgar, obscene anecdote as well do not please Undertaker. An hour later, Undertaker, having successfully taped Lau's and Angelina's mouths, concludes that Ciel is the only one left to make him laugh.
However, Sebastian intervenes, signaling that it is his turn. He requests the rest of them to step outside and forbids them from peeking in. Sebastian manages to deliver an impressive joke that sends Undertaker into a wild fit of laughter. Afterward, he agrees wholeheartedly to tell them whatever they want to know.
Undertaker then reveals that Jack the Ripper's victims are all women prostitutes and are missing most of their internal organs-most notably their ovaries. As it is his hobby to take out the organs for research—which causes Lau, Angelina, and Grell to be wary of their drinks that could have potentially stored a kidney—he was able to discover this important fact. He adds that the organs are removed with such precision that only a medical professional could have committed the crimes and that the victims are whereby former prostitutes with their uteri specifically removed. After relaying the information, Undertaker tests Ciel's resolve, but Ciel ascertains that he will not be afraid and that he will solve all mysteries.
After the murders are solved, at the outside boundaries of an occupied church, Undertaker informs a group of children that a great ceremony is taking place, which is actually Angelina's funeral. At the cemetery, Undertaker has prepared a proper burial for Jack the Ripper's final victim, under Ciel's orders. He says that Ciel is kind for giving a nameless prostitute her own grave, but Ciel dismisses the claim, as he had put catching the killer as his priority rather than saving her life. Undertaker asks if he regrets letting Angelina, his own aunt, die, but Ciel denies it, saying that he does not because with the killer gone, Queen Victoria can be at ease. Undertaker comments that he dislikes the Queen because she leaves the "painful, dirty" work for Ciel to complete. Ciel replies that it is the fate his family has been burdened with, and he has inherited it with his ring. Undertaker retorts that the ring acts like a collar, connecting Ciel and the Queen with a chain called "karma." Ciel tells him that he was the one who decided to the put the collar around his own neck, and Undertaker warns him that it may choke him one day. Then, as he takes his leave, he tells Ciel and Sebastian that they can stop by his parlor anytime.
Ciel and Sebastian visit his funeral parlor again, this time to find out if any of the children abducted by the Noah's Ark Circus have shown up dead. Undertaker insists on receiving his first-rate laugh first, and he challenges Ciel to personally deliver him it himself. Ciel takes quite a deal of time, but at last, Ciel manages to accomplish that, albeit using an implicitly embarrassing method.
Undertaker then reveals that none of the children is one of his "clients" and that he has not heard any rumors from the underworld companies. Ciel believes that Undertaker has deceived him, but Undertaker denies the assumption, pointing out that the nonexistence of the children's corpses serves as a great clue: it is indicative that the children are still alive. As Ciel begins to leave, Undertaker tells him to keep his soul safe.
Several days later, Undertaker observes the burning of Baron Kelvin's manor from afar, while playing with lockets. (On one locket, there is a date and a name engraved: 13 July 1866, Cloudia P.) He says that he had warned Ciel to hold every soul dear, and he states that Ciel will understand the importance of things that cannot be recovered once it is too late.
Phantomhive Manor Book of Murder Arc
After Charles Grey and Charles Phipps deliver a letter from Queen Victoria to Ciel, Ciel tells Sebastian to contact Lau as well as Undertaker. Through Undertaker, Ciel is able to confirm that Karl Woodley has committed a heinous crime.
Later, Undertaker provides a safety coffin for Sebastian's funeral. When a bell installed in it rings, he informs Ciel, Elizabeth Midford, Soma Asman Kadar, Agni, and the servants of the Phantomhive household that that means Sebastian is still alive. They dig him back up, and Undertaker tells them to come back anytime.
Luxury Liner Arc
On April 17, 1889, Undertaker boards the Campania. Three days later, he attends an Aurora Society meeting. He bursts out laughing when he sees Ciel performing the Phoenix pose. When Sebastian asks him why he is there, Undertaker explains that the Karnstein Hospital is a regular customer of his. Ciel presses him for more information, but Undertaker refuses to give it unless Ciel performs the pose again. Ciel and Sebastian are, then, distracted by Aleistor Chamber.
The meeting, which is headed by Rian Stoker, commences, but soon develops into a disaster when Margaret Connor is revived as a Bizarre Doll. She then kills her mother and attacks the other attendees, most of which flee from the scene. Undertaker leaves, as well.
Later, Aleistor has Undertaker, along with a few others, carry Rian's device, which can supposedly render the Bizarre Dolls inactive. They encounter Ciel and Sebastian in the first-class passenger hallway, and Undertaker is amused when Ciel performs the Phoenix pose again. When Ciel asks him how to activate the device, and Undertaker states that he does not know and that he does not see how the device will be of any help.
At the first-class passenger lounge, Aleistor orders them to set down the device. Rian, Grell, and Ronald Knox arrive. Soon after, Bizarre Dolls invade the area, but Aleistor is not willing to activate the device unless they pledge their loyalty to him. When Ronald, Grell, Sebastian, and Ciel express their desire to kill him, Undertaker reminds them of the device. They, then, including Undertaker, perform Aleistor's version of the Phoenix pose. Subsequently, Aleistor tries to activate the device, only to realize that it does not work; Undertaker laughs hysterically. Appalled, Rian asks Undertaker if he has fooled him.
When an exasperated Grell attempts to kill Aleistor, but Undertaker stops them, to everyone's surprise. Undertaker says that he does not want to lose the highly amusing Aleistor and acknowledges Grell as a Grim Reaper. Grell is stunned that their Death Scythe was unable to cut through Undertaker, who shoots his sotoba at Grell. Subsequently, Undertaker lifts his bangs, revealing his chartreuse phosphorescent eyes.
Sebastian, Grell, and Ronald realize that Undertaker is a Grim Reaper. Undertaker asserts that it has been half a century since someone last called him one. Rian approaches Undertaker, demanding answers, and Undertaker discloses the fact that he was simply using Rian, who does not qualify as a doctor, in his perspective, to a disheartened Rian. Ciel deduces that Undertaker is the mastermind behind the Aurora Society's human resurrection experiments, and Undertaker confesses to making the Bizarre Dolls, claiming that he owes Ciel information for doing the Phoenix pose. He describes his previous life as a Grim Reaper and his curiosity toward humans, which led him to edit their Cinematic Records in order to achieve a "continuation" after death. He has Grell inspect one of the Bizarre Dolls' Cinematic Records for them to see for themselves. Undertaker also explains that Bizarre Dolls seek other people's souls because they lack their own; he was unable to create souls, even after tampering with the Records, and, thus, he named the corpses Bizarre Dolls, as they are not living nor are they dead. When Ciel condemns it, Undertaker says that he does not understand the beauty of it.
Undertaker asserts that there are humans interested in employing Bizarre Dolls as animal weapons, for they do not feel pain or fear and eat the living. Those humans wanted to test the effectiveness of Bizarre Dolls; therefore, an experiment was conducted on the Campania, with the same amount of humans and Bizarre Dolls together in one place, to see how many will survive on each end. He, then, admits that he did not expect for them to crash into an iceberg; because he is no longer working as Grim Reaper, he does not have the soul retrieval list. He adds that he, at least, does not have to go through the trouble of sinking the ship himself, and points out that, due to their interference, a lot more humans survived than anticipated.
Grell and Ronald resolve to detain Undertaker, who is a "deserter." They attack him but are unsuccessful. Sebastian intervenes as well, stating that he must capture Undertaker, as Ciel must present him to Queen Victoria. The two teams prepare to vie for Undertaker. Undertaker compares it to a rabbit hunt and wonders aloud which rabbit is being hunted. Sebastian, Grell, and Ronald simultaneously lunge at Undertaker.
During the fight, Undertaker states that Grim Reapers are all heavily nearsighted. Grell asks him if he is at a disadvantage then, because he does not have his glasses anymore, and successfully cuts his sotoba, much to their surprise as they could not do so at first. Undertaker kicks Grell while they are distracted. He, then, attacks Ronald, who dodges but his glasses are knocked off his face, causing his eyesight to go blurry. Undertaker kicks Ronald's face, and Grell throws Ronald's glasses back to its rightful owner, but Sebastian prevents Ronald from catching them with his tableware. Sebastian, then, aims for Undertaker; however, the latter stops the knives with his sotoba asks whether Sebastian thinks that he will be able to take him down with tableware. Sebastian claims that while it may not be as good as a Death Scythe, but it has top-grade sharpness.
Undertaker taunts the three of them. Ronald, who has gotten back his glasses, and Grell agree to a head-on attack, as they are running out of time, but are unable to cut Undertaker's sotoba. Grell maintains that there should be nothing a Death Scythe cannot cut. Undertaker tells them that there is one thing a Death Scythe cannot cut and slashes Grell and Ronald with his own Death Scythe, which he had smuggled out with him when he quit being a Grim Reaper. Undertaker declares that he will hunt them now, and destroys one of the pillars on the ship, which falls on Grell and Ronald. Sebastian hurls tables at him, and Undertaker effortlessly cut through them, but soon realizes that it is merely a diversion; Sebastian appears behind Undertaker, saying that he just wanted to get within the wide reach of the Death Scythe. Undertaker affirms that Sebastian's way of thinking is interesting, and says that he will also do something interesting. He, then, takes Ciel as his hostage, to Ciel's and Sebastian's shock. He tells Ciel that he can finally put him in one of his specially-made coffins. Sebastian lunges at him; Undertaker, who has expected this move, tosses Ciel. Sebastian turns around, reaching for Ciel, and is impaled from behind by Undertaker's Death Scythe. Undertaker, who has always been curious about Sebastian's motives, watches Sebastian's Cinematic Record.
Sebastian manages to catch Ciel, just as his Cinematic Record finishes playing. Undertaker says that he knew Sebastian would be able to save Ciel and adds that while his Record is interesting, he only makes Ciel miserable, and, so, he will kill him. But, before he can attack, the Campania begins to sink and tilt heavily, and Rian falls to his death. Grell attacks Undertaker, while Ronald fights Sebastian. Undertaker recognizes Grell as Angelina Dalles' butler and comments that Grell also tampered with lives. Grell calls him nosy and refuses to leave, even after Undertaker points out that time is almost up for them. Sebastian throws Ronald at Grell, and they crash. Water starts flooding in, and Undertaker decides that it is time for him to leave. Sebastian and Grell both attack him, and he dodges but drops his chain of lockets, which Ciel grabs. He decides to leave his "treasure" with Ciel and tells him to keep it safe. He, then, bids Ciel farewell, and slices the ship in half with his Death Scythe, disappearing in the process.
Public School Arc
After turning the deceased Derrick Arden into a Bizarre Doll, Undertaker takes on the persona of the headmaster of Weston College. He lets Johann Agares speak for him, and he manages to elude Sebastian upon pursuit. At the midnight tea party, Sebastian, having reached a conclusion, tells him to drop the teacher act. Undertaker then tells Ciel that it was "truly pleasant watching [his] struggle from the grand tier" and that he has offered him the best of laughs. He removes his hat, and he reveals to them that he is, as Sebastian has hypothesized, Undertaker.
He casually greets Ciel, commenting that the Earl is still tiny. He is pleased to know that Ciel has been well, and he then asks about his first experience with group life. Sebastian remarks that Undertaker, prior to taking the headmasters' place, disappeared after closing his shop. Undertaker responds that it is only temporary. After the prefects narrated what had happened with Derrick, Undertaker bursts out laughing.
On the other hand, Ciel notices the difference between the previous corpses they have encountered from Derrick Arden as a Bizarre Doll. Undertaker is delighted by the Earl's observation. Undertaker replies that he will tell him since he has been paid his fee. He states that he has discovered that even the dead can evolve. They have their dreams of the future; this compels them to move forward. Ciel demands to know what he plans to achieve by bringing the dead back to life. Undertaker answers that he wants to know what comes after the predetermined end. As Ciel starts, Sebastian holds onto his arm. Undertaker adds that there might be interesting developments lurking behind the "end credits." Sebastian then interrupts that this where they disagree—because death is such a hopeless and definite end, that is why it is beautiful. After hearing Sebastian's response, Undertaker is silent. Undertaker then announces that he will be taking his leave now; Ciel declares that he will not let him get away again.  He orders Sebastian to capture him, but Johann comes to Undertaker's defense. Sebastian comments that he knew it—Agares is also a Bizarre Doll. Undertaker proclaims that Agares was his masterpiece. Derrick's friends suddenly surround the other boys; Ciel yells at everyone to get out of the garden.
Meanwhile, Sebastian states at Undertaker, asking him if he thinks this Doll is enough to hold him—Undertaker is really underestimating him. Undertaker replies that he is not underestimating him—they just have completely different goals. Jolted, Sebastian sees an incredibly realistic simulation of their fight in his mind—Undertaker would easily capture Ciel and use him against him. Alarmed, Sebastian realizes that there is only one course of action—he breaks free from Agares and rushes to Ciel. At the same time, Undertaker escapes, stating confidently he knew that Sebastian would do that—he should continue to loyally protect Ciel forever.
Ciel immediately yells at Sebastian, telling him he ordered him not to let Undertaker get away. Sebastian replies that as per the contract, protecting Ciel's life is his top priority. As he smashes one of the doll's skulls, he adds that he cultivated it, so he will not be robbed of it.
Emerald Witch Arc
Undertaker visits Diedrich, telling him that he has something to do in France and decided to stop by. He notes that they have not met since Vincent Phantomhive's funeral and that Diedrich does not visit England often, wondering out loud if it is because Vincent is no longer there or because Diedrich is too weighty. He bursts into laughter, much to Diedrich's chagrin. He then holds up a photo of Vincent and Diedrich during their Weston College days, remarking that humans change very quickly and that Diedrich used to be thin. He quips that Diedrich's coffin must be custom-made, offering to measure Diedrich, but Diedrich refuses. Undertaker adds that Vincent would laugh if he were to see him now, and then sheds a tear while reflecting on Vincent's death. He puts the photo back in its place, commenting that the "Earl of Phantomhive" is still with them, before leaving.
Blue Cult Arc
Undertaker appears secretly in Ciel's room late at night while Ciel is asleep. While Ciel still sleeps, he makes him swallow a mysterious liquid. When Ciel wakes up half asleep, not knowing it's the Undertaker, he asks him if it is morning already; Undertaker then smiles, covers his eyes with his left hand, and replies that he should sleep a little longer because it is too early for him to wake up. He then disappears from the room. 
- (To Ciel Phantomhive) "Ah, Earl. Do you want to see how it feels to sleep in my custom-made coffins?"
- (Referring to Jack the Ripper) "The world of darkness has the world of darkness's rules. He wouldn't murder random people for no reason. There must be an influence manipulating him from behind."
- (Referring to Angelina Dalles) "Today is a particular woman's special gala. The final great ceremony in each human's life. A funeral."
- (To Ciel Phantomhive) "Victoria, aye? I'm not a fan. She sits herself up so high above everyone else, and leaves the painful dirty work to the Earl."
- (To Ciel Phantomhive) "I wonder, if the butler isn't here, is the Earl just a child who can't do anything?"
- (Referring to Ciel Phantomhive) "Even though I told him to hold each and every soul dear. Because you hold great power, you gradually fail to understand the importance of things that cannot be recovered. You will realize once it's too late. How many times have I given you and the others the same warning?"
- (Referring to Aleistor Chamber, while fighting Grell Sutcliff) "It's been a while since I've laughed so much. To lose such an amusing man would be like losing the whole world to me. Don't you agree, Grim Reaper?"
- "How sad it would be, should laughter disappear."
- (Referring to the Bizarre Dolls) "This beautifully stitched skin as white as wax, just like when they were alive. Their mouths that cannot clamor noisily or tell lies any longer. Aren't they all far more beautiful than when they were alive?"
- (To Ciel Phantomhive) "It was truly pleasant to watch your struggle from the grand tier. You've offered me the best of laughs."
- (About Bizarre Dolls) "What's driving them now is . . . their yearning for a future. In their dying moments, humans review their past life. These images come and go. At the same time, they crave the future they were supposed to have. They're fragmentary of course, but those fragments are the episodes. These are like a predictive map of the future. My self-created memories are nothing compared to these future memories. So if we stuck these to the record . . . wouldn't it become complete?"
- (To Ciel Phantomhive, about the concept of death) "You've never thought about it? There might be an interesting development lurking behind the ending credits."
Out of Universe
- According to the official Kuroshitsuji character popularity poll, Undertaker is the third most popular character in the series, with 1284 votes. He is ranked among the "Devil Six", a group of the highest ranking characters of the manga.
- In battles, Undertaker would wield sotoba, which are inscribed strips of wood found at tombs in Japanese cemeteries.
- Undertaker's design was based on the design of the protagonist of a pirate manga Yana Toboso planned before she started working on Kuroshitsuji.
- In the first season, Undertaker was a renowned Grim Reaper, who was ranked management level, and he had judged souls as famous as Marie Antoinette and Robin Hood. William T. Spears said that even crying children would have willingly given up their souls to him. He was highly respected by William, but he did not return the feelings, calling William "annoying and noisy."
- His Death Scythe was shown first in the anime rather than the manga.
- During the making of the first season, Yana Toboso told the staff to make Undertaker's hair look like as if it was not washed in long.