;Haruomi Io :The main protagonist is sixteen-year-old Haruomi, who initially feels powerless to protect those that are precious to him. He was involved in an accident as a child where he lost loved ones so has retained guilt through the years. Encountering Zilch changes his life as she reassures him that he is "not powerless" and vows to protect him. Haruomi becomes involved with Seventh Gospel Organization and takes the role of Annihilator to hunt down rogue devils. Haruomi later learns that his father and Levi were researchers of the Goetia institute but left in disgust when the company's desire for power grew. An unexplained explosion within the company soon followed. He enrolls at Kanmeikan High School while tracking down a "branch" named Hato which ends in success. He also learns that before his father left he had infused
King Solomon's ring inside of him which gave Harumoi the ability to nullified and some control over all 72 demons. He has stated to Astaroth inside of Zilch that he wants to grant her wish. After Harumoi's father's death, he resorts in rescuing Murohime and Zilch from their burden, and went back to everyday life at school regardless of the love triangle. ;Zilch Kanoa :The lead heroine and "29th Branch" that is the incarnation of the Demon Archduke
Astaroth. Zilch is a young girl with pink
twin tail hair, having been born within the past two years from Goetia. She is connected by an engagement with Haruomi, having pierced a that bears a caduceus seal onto him. Able to manifest more power than ever, she can repulse and distort space around her, and disrupt kinetic energy. She enrolls Kanmeikan Middle School, much to her dismay of not being close to Haruomi. Haruomi discerns that Zilch is somewhat familiar to him, later revealed Haruomi's deceased sister Ayana harbors Zilch's body. Ayana had experience a ravaged event and her mind was reconstruct into the Astaroth. Astaroth's goal is to reclaim the status of an
angel by doing good deeds for others, while the human side of Zilch appears to have feelings towards Haruomi. In contrast to Zilch, Ayana is devoted to her big brother, but has a malice and
yandere behavior whenever someone gets Haruomi's attention. While maneuvering Zilch's body, Ayana attempts to kill Murohime to have Haruomi all to herself. ;Murohime Yakagi :Murohime is a buxom nun who starts out as an
annihilator in the Seventh Gospel Organization. She initially enrolls at the local high school with Haruomi on an undercover mission to find "branches" (female humans fused with demons). It is later revealed that she is really Haruomi's childhood friend "Akino Kiriba" who in fact had survived being tested upon by Goetia. The testing involved a failed attempt to use her body as a vessel for the archangel
Lucifer. Due to the failure, Murohime only has memories from three years ago all involving the church from where she got her current name. She has since been seeing visions of her younger self who tries to get her to remember the past. When Akino finally recovers her memories she looks back on how she had been orphaned and isolated until meeting Haruomi and Ayana. She developed feelings for Haruomi before facing an unsuccessful murder attempt by her jealous friend Ayana. Flashing forward, Haruomi confesses his love to her shortly before the series
climax with ends in a victory. Akino winds up leaving the Seventh Gospel Organization for lying to her in favor of becoming a
student, but chooses to keep the name "Murohime." Despite declaring herself as Haruomi's "girlfriend" she continues to fight with Zilch for his affections. ;Hato Mitsukuri :Hato is the "4th Branch" that is the incarnation of vengeful ghost marquis
Gamigin. She had pierced a into a school teacher named Ms. Mishino while in hiding, but then extracts it when she is discovered by Haruomi and Murohime. She can cease a person's five senses, and skilled in computer hacking. When Haruomi uses Solomon's ring on her in battle it is revealed that she has an inner desire to live that awakens. Having been spared, she falls in love with Haruomi and pierces him with a new that Zilch later overwritten. Hato once thought of running away with Haruomi to escape the dangers. She soon admits there is no room for her in Haruomi's heart even though the other Branches are persistent. ;Tounogi Haime :Tounogi is a confident member of the Seventh Gospel Organization and Shijima's master. Although loyal to the church, he serves a good companionship with Haruomi and Murohime. He has an older sister who is currently abroad at another Goetia institute in Europe as the "56th Branch" the incarnation of
Gremory. Like Haruomi, Tounogi hopes to be reunited with his sister someday. ;Kurohazumi Shijima :She is Tounogi's Branch and the first one who engages Haruomi in a blunt attack. Shijima is the "25th Branch" that is the incarnation of president of the Dog Kings
Glasyalabolas. She specializes in manipulating shadows.
Secondary characters ;Sitri :The "12th Branch" and incarnation of the
Sitri. She has cat ears and expresses a deep demeanor before being impaled by Zilch shortly the start of Volume 2. Her real name is unknown. In reality, she has been absorbed into Haroumi via
the ring of Solomon and defends him. ;Tobari Kemizuka :She is the "14th Branch" the incarnation of the
Leraje. Soft-spoken demon archery but she won't hesitate in firing deadly Sagittarius arrows that weary wounds till certain death and allows her traces them, while only she can heal it. She is obedient to commands. After being fatally stabbed by an embodiment of Sitri, Tobari was also absorbed compel into Haroumi. Tobari finds it odd and eventually concedes to Haroumi's well-being. ;Evelina Zieliński :She is the "28th Branch" that is the incarnation of Duke of Cruelty
Berith. Capable to turn space into her own territory and decapitates victims. Invading the church and captured Haroumi's father under orders of Goetia. She sparks an interest in Haroumi when discovering he is the ring of Solomon and tried to implant him a "Thron" against his will. When facing Zilch's words and separate ideas, Evelina begins to doubt the meaning of freedom or submit to structural collapse. She and Karen temporarily team with Haroumi for his kindness. ;Karen Houzumi :A carefree demon that has naked eyes with a star-shape pattern. She is the "69th Branch" incarnation of the
Decarabia. Summoning a pentagram circle to teleport and eliminate (including light beam vision) is her power. Karen has an unbroken bond of three, consisting her, Evenlina, and Tobari. ;Sophia :A seemingly innocent demon. Sophia helps Zilch and co. infiltration of Goetia. Her incarnation status is the "Magquis of Flame or
Amon" the "7th Branch". Sophia can emit enormous flares and create flaming birds. Has a friendly relationship with Haroumi. She is more interested in living a free life other than following the Beelzebub's customs. ;Hellentza Fitzengahen :A powerful demon who can trigger seismic events. Her incarnation of "Lord of the Flies,
Beelzebub" ingrained makes her the few ineffective of the Solomon's ring. She is Zilch's former friend. After assassinating Goetia's eastern laboratory compound, she controls like ninety percent Branches as her followers. Her intent is to execute something called 'Project Eden' other than the previous
Qliphoth operation, and search for her self-proclaimed Lucifer. Unearthing Murohime's true identity, Hellentza negotiates her into bring forth the Armageddon upon the world, although Zilch's second personality gets in the way of the Branches' goal of reaching heaven. ==Release==