Shioiri Yayoi

Yayoi is another classmate of Ritsuka's. He is shown as being socially awkward and with low self esteem, and feels great jealousy towards Ritsuka. Yayoi admits that he loves Yuiko, but when he confessed to her, he was rejected for being too short. Yuiko claims that she only dates boys taller than her, but the truthfulness of that statement is called into question when it is painfully obvious she loves Ritsuka, who is barely taller than Yayoi.

Despite his jealousy of Ritsuka's close friendship with Yuiko, he is encouraged by Ritsuka's adamant claims that their relationship is purely platonic. He makes a firm statement he will not give up on Yuiko, and spends more time with her than ever.

It is notable that in the manga, Yayoi has a rather small role. He is absent for large parts of the story, and has only a small amount of dialogue. In the anime, they utilized his character much more to enhance the would-be Yayoi-Yuiko-Ritsuka love triangle, and to inject comic relief into a dark story.

Akame Nisei

Akame Nisei helps keep track of Ritsuka by spying on him and reports the information back to a mysterious boss. He and Soubi meet in volume 6 and from then on, Nisei stops spying on Ritsuka, but his presence is still near.

His role in volume 5 was a pivotal one: he was first introduced as "Seimei," although he was only masquerading as Seimei to gain the trust of Misaki. It is unknown if it was carried out by Seimei's orders, but Nisei ended up drugging Misaki and trying in vain to convince her to murder Ritsuka, on the promise that Seimei would come back for good. Due to his smug demeanor and malicious behaviour towards Ritsuka, Nisei and Soubi have great animosity between each other. In volume 6, Soubi expresses his deep desire to murder Nisei at any cost. Volume 8 shows that he was captured by security at the Seven Voices Academy, but despite his struggles to respond to Seimei's calling, it appears that he was successfully restrained.

There is a strong belief among fans that Nisei is a Sociopath, judging by his actions and the way he says he can't experience feelings such as love or desire. Although his character is largely a mystery, he appears to be very devious. He is the real Fighter Unit of Beloved.

Seimei Aoyagi

He is Ritsuka's older brother. Born on November 14th, his name comes from the lunar day "Seimei", which falls around April 4th. He was seventeen when he was found murdered, although he died under mysterious circumstances and could only be identified by his dental records. We later learn that Seimei had faked his death, but who the person was that died in his place has not yet been revealed. He is also the sacrifice of the Beloved pair. Soubi was given to Seimei (mostly at Seimei's request) as a fighter when Seimei was only fourteen years old. It is speculated by fans that there is some kind of rivalry between Seimei and Ritsu over Soubi and perhaps over other things, but there's no information in the series that confirms these speculations.

When Ritsuka lost his memory, Seimei stepped in and became an extremely important figure in his life. He protected Ritsuka from their abusive mother, Misaki, and was a great source of comfort and trust. As a result, Ritsuka was hit hardest of all by the news of his brother's death. He is very bitter and vengeful towards those who may have been involved in the murder of his brother.

His personality is subject of great debate, and many readers have very different interpretations of his actions. To make things more confusing, the characters in the story themselves clash with their different beliefs and experiences. Ritsuka claims Seimei was a kind, gentle, loving person that always protected him. Soubi, on the other hand, is almost afraid and spiteful of Seimei. He tells Yoji he would have to wait a hundred years before Seimei would speak to him. Misaki, Ritsuka and Seimei's mother, believes Seimei will protect her from hurting Ritsuka. Others, such as Nagisa and 7, think he was cruel, merciless, and hateful. They claim Seimei acted strangely and would be close to no one, and go so far as refusing to eat in the presence of anyone else. Soubi's friend Kio bitterly resents Seimei for the apparently abusive manner in which he treated Soubi, but Soubi refuses to back up Kio's accusations. Ritsuka denies all of this; however, he has some startling flashbacks that show a more disturbed, obsessive side of Seimei, and even sometimes borderline incestuous behavior towards Ritsuka. Seimei has said in Volume 7 that in his world, he and Ritsuka are the only two humans that exist and everyone else to him is an animal. He later states in volume 8 that Ritsuka is the only human alive that is exactly like him.

However, it has recently been confirmed that Seimei does indeed have a violent personality, or destructive behavior at the very least. In volume eight, Seimei stabs the wary Ritsu in the eyes after the two have a short yet heated conversation about Soubi; the wounds leaves Ritsu blind. Seimei then proceeded to write the haunting message "Ritsuka I'm Back" on the wall in Ritsu's blood for his brother, Ritsuka, to later see. There are also suggestions in canon that Seimei possesses powers beyond that of a normal sacrifice. He has been described as inhuman by Soubi and others.

Hitomi Shinonome

She is Ritsuka and Yuiko's teacher. She is very naive and innocent, and painfully aware of these characteristics. At twenty-three years old, she is teased and ridiculed for retaining her ears (and therefore her virginity) to such an age. She is visibly embarrassed, but as the story progresses, she gains confidence and pride over making her own choices.

Hitomi is greatly troubled by Ritsuka's mother and the injuries he sustains from her, and greatly desires to involve herself in the situation to make a change, despite her fears and her colleagues' dissent.

Her very caring and naive nature clashes spectacularly when confronted with Soubi. He brusquely rejects her and says he doesn't care for older women, despite the fact she never made a romantic move towards him and is no more than three years older than him. Despite his cold treatment, Hitomi seems to have had some feelings for Soubi, due to the fact in volume 2 of the manga (episode 8 of the anime), she burst into tears and brooded over him. His brash actions are mysterious, but a bit more reasonable when you consider his undiscerning hatred towards teachers as a result of his experiences with Ritsu Minami.

Although he has rejected her, it can be noted that Soubi enjoys tormenting her to some degree. In their first meeting, he takes pleasure in confronting her uneasily face-to-face. In volume 2 of the manga (episode 6 of the anime), he holds her closely when she faints. This is notable because there are only two characters he physically interacts with in the entire series: one being Hitomi and the other Ritsuka.

Reasons for this awkward behavior towards Hitomi may be stemmed from jealousy. It is interesting to note that Soubi refers to Hitomi as 'childish', despite her being three years older than he is. Yet he still respectfully calls her "Shinonome-sensei." The only way he degrades her is by her sexuality, possibly because Hitomi has remained a virgin while he lost his ‘ears’ at a much earlier age. In volume 2 of the manga and episode 6 of the anime, Soubi also 'saves' Hitomi from the male Zeros, Yoji and Natsuo. They threatened to get rid of her ears, despite the Zeros being very young themselves, and she protested immensely. Although she is grateful for Soubi's protection, it only embarrasses her more. In comparison with his extreme dislike of his own teacher figure, Ritsu, Soubi still manages to treat Hitomi as a subordinate, constantly belittling her.

Kio Kaidou

He is a friend and classmate of Soubi's. They are both art students, and in volume 6 Kio tells Ritsuka, "I'm probably Sou-chan's only friend." It is all but explicitly said that Kio is homosexual. Most of his early dialogue is filled with flirtations and passes at Soubi, despite being gently ignored or indirectly rejected each time.

Despite his early presence as a character who exists solely to create a lighter atmosphere among a very dark story, he gradually gains depth and justifies his existence as the story progresses. He becomes a loud voice that champions pacifism and self-worth. This contrasts strongly against Soubi's submissive nature that willingly accepts violent treatment and strongly desires to be completely controlled, albeit from only very certain people. More significantly, Kio's views are shared by Ritsuka. Together, they provide a very black-and-white atmosphere that allows only one line of thinking.

It was recently revealed that Soubi only became interested in Kio because of a tattoo on his back, and a vow that he took when he got it.

Yuiko Hawatari

Yuiko is Ritsuka's classmate. Despite her ditzy, bubbly exterior, she is sharp and goodhearted. On Ritsuka's first day in school, she immediately is overcome with awe and a fascination for him. At the prodding of her mean-spirited classmates, she befriends him, although he is very reluctant to accept her because he thinks she is weird and unintelligent. As Ritsuka overcomes his initial impressions of her and realizes she is rather smart, they become good friends.

Yuiko and Ritsuka's friendship greatly irritates their classmate, Yayoi. He had been recently rejected by Yuiko, although rather sorrowfully, claiming she will only date boys taller than her. Much to Yuiko's dismay, Ritsuka insists their friendship is platonic and it, indeed, remains that way. However, in two separate confessions to Hitomi Shinonome, Yuiko professes her love and devotion to Ritsuka. Their relationship is close, but Yuiko's seems to be a one-sided obsession. One incident of Ritsuka actually demonstrating care for Yuiko is in volume 2 of the manga and episode 4 of the anime, when she is bullied by her 'friends', whom Ritsuka fittingly says are using her. Because Yuiko had brought Ritsuka homemade strawberry jam, they went so far as to smash the jar in front of her, and demanded she apologize for breaking school rules. Ritsuka came to her aid and stated that they were 'less than human'. This may have spurred on her love for him. Though, a notable scene in volume 4 depicts Ritsuka abandoning Yuiko abruptly to go to Soubi's aid, and Yuiko sadly recalls her efforts to become good friends with him without achieving any results.

Yuiko also has a fear of heights indicated in episode 11, while on a ferris wheel with Ritsuka.

As the series progresses, a rather unusual, yet harmonious, friendship is struck between Yuiko and Soubi. Although it seems their personalities would clash, they have a unique understanding of each other.

In an early 2005 interview in Japanese magazine Pafu, Kouga Yun stated: "She emerged when I wondered, 'What kind of girl would it take for Ritsuka to be happy?' While she was created to match Ritsuka, she changes from meeting him ... with some injection of intelligence. She honestly wants to change to become worthy of Ritsuka because she likes him. So if Soubi wasn't around, they'd make a great couple."

Yuiko is characterized by her unusually large breasts and considerable height. At 167 cm tall, Yuiko is much taller than Ritsuka and her other classmates and is often mistaken for being older than she actually is.

Soubi Agatsuma

Soubi is a twenty-year-old student, studying Japanese art. He is a former student of Shichisei Gakuen (correctly translated as "Seven Voices Academy"), a school for fighters, where Ritsu Minami was his teacher.

As ordered, Soubi contacted Ritsuka after Seimei's death. He introduced Ritsuka to the world of fighters and sacrifices and told Ritsuka he would be his Fighter Unit. He fought beside Seimei for some time, and many people believe that he is Beloved's Fighter Unit. The appearance of Nisei in the manga, however, proves this to be false later in the manga. Soubi now fights for Ritsuka as Loveless, which is considered taboo because there is not a fighter-sacrifice bond between them. There is also a severe loss of strength, and in Soubi's case, his markings bleed in battle. Soubi was revealed to not have a true name at all — in fact, Ritsu comments that he is a blank slate, and whatever marking he is given becomes his name. Since Seimei carved Beloved into his skin, it became his name. When given a command to break the windows, courtesy of Seimei, in volume 8, it is shown that he cannot disobey, no matter how strongly he is against it.

Soubi appears to know much more about Seimei and his cause of death than he will divulge. Despite Ritsuka's insistence that he tell him everything he knows, Soubi refuses. In volume 5 of the manga, he even says, "Seimei is my God." He openly declares that he lives his life by Seimei's orders, but still says he'll obey Ritsuka's every order, which is not necessarily true.

In flashbacks to Soubi's childhood, he is shown to bear a strong resemblance to current-day Ritsuka.