Agni is a large, muscular young man with black hair. For the majority of the series, his entire body is on fire, say for his mouth and the left side of his face. He briefly wore a fireproof suit composed of a black jacket, a pair of black pants, a white dress shirt with a red necktie, a gray hood and metal armor on his right arm. During his crazed murder of Doma (as well as his brief encounter with an older Sun), Agni's entire face was engulfed in flames, giving him a more demonic appearance. Agni grew up with his younger sister, Luna, and his parents until a group of men broke into their home and murdered his mother and father to be used as food and kindling for the fire. However, due to their ability to regenerate, the sibling were held prisoner by the men and repeatedly had their limbs cut off to be used for the same purpose as their parents. Some time later, one of the men attempted to rape Luna, but Agni broke out of his shackles by breaking his own arm and killed the man with a butcher knife. Agni then freed Luna by cutting off her limbs, promising it would be the last time she'd ever have to feel that kind of pain. Agni and Luna wandered across the snowy wasteland in search of shelter and were on the verge of death; luckily, the pair were found by a group of people and brought to their village. Three years later, Luna assists Agni in providing meat for the village by chopping off his right arm repeatedly.
39;re searching for Blessed Ones to bring with them to the city of Behemdolg.
When Luna suggests using her own arms at some point, Agni rejects it, refusing to let his sister go through any kind of pain. After delivering some of the meat to an older woman known as Granny Jishima, they went to visit a man named Bana, who turned out to have died from starvation, as he refused to eat human flesh. Agni feels responsible for Bana's death, but Luna comforts him and suggests calling the Priest. At dinner, Luna offers her brother some stew she made from his arm, but he declines, stating his Regeneration Blessing makes eating unnecessary for him. Despite this, Luna still insists that he has some whether he needs food or not, to which Agni gives in. As the siblings prepare to sleep, Agni tells Luna how he remembers swimming in the lake on hot days before the world froze, and how the water was different from the cold of the present, Agni promises to show Luna the world once it gets warmer. The next day, Agni returns home after hunting a deer when he sees a plane flying towards the village and, upon investigating, sees a large group of men rounding up the older members of the village at gunpoint. Agni tries to intervene, telling the men to leave the elders alone, but is then approached by a man called Doma, who explains they're searching for Blessed Ones to bring with them to the city of Behemdolg. Upon hearing one of the soldiers report the village houses were filled with human meat and the villagers were cannibals, Doma orders the soldiers to return to the plane before setting the village ablaze with his Fire Blessing.
39;s burning, he simply lay and screamed in agony through the blizzard.
During this process, Agni becomes engulfed in flames, but is unable to die because of his Blessing. Surrounded by the blazing houses and charred bodies, Agni wishes to he could just die. However, whilst he is thinking of his family, a heavily burned Luna shuffles towards him and, just before her body is reduced to ash, utters her final word: "Live". During the first year of Agni's burning, he simply lay and screamed in agony through the blizzard. After three years, he manages to stand up and stumbled across the wasteland before spitting up blood. Upon year five, Agni finally manages to ignore the constant pain and ends up becoming extremely muscular as a result of moving but is unable to properly breathe due to the flames. Finally, on the eighth year, Agni learns how to control the flames on his body and focus them away from his face, allowing him to breathe normally.
As he heads for the city, the boy follows him in spite of his protests.
After this point, Agni begins his journey in search of Behemdolg in order to exact his revenge against Doma. As he travels, he encounters a boy about to be executed by Behemdolgian soldiers, whom Agni quickly kills. After freeing the slaves captured by the soldiers, Agni states he had no intent of saving them, and asks where he should go to reach Behemdolg. As he heads for the city, the boy follows him in spite of his protests. The boy introduces himself as Sun, who was caught by the soldiers after he was run out of his village. That evening, Sun makes a campfire, and asks Agni to light it. Agni states that his fire is too dangerous to be used, and tells Sun to find another way to light the fire to which Sun uses his Electricity Blessing. When Sun thanks Agni for rescuing him again, he states that he had no intention of saving the boy, and that he didn't care whether he lived or not, but that he'd have difficulty sleeping if he saw someone die in front of him. After Sun falls asleep, Agni collapses as he began to give in to the pain of his burns. He attempts to occupy himself with the thought of exacting revenge on Doma to get his mind off of the pain. However, he is suddenly shot in the head by a soldier from Behemdolg.
When Agni emerges from the snow, he finds Sun is nowhere to be found.
Of course, due to his Regeneration Blessing, Agni isn't killed by the bullet. As the other soldiers prepare to rape Sun as they wait for Agni's flames to die, one of the soldiers is set ablaze by him. As the soldiers attempt to gun Agni down, he proceeds to kill them one by one with a flurry of burning punches. Throughout the fight, Agni thinks about how he feels pleasure from punching others and being barraged with bullets, and how the pain of his burns mellows out. He stops, however, when he sees one remaining soldier holding Sun at gunpoint, threatening to kill him. Agni tells the soldier he doesn't care what happens to Sun, as the boy followed him of his own volition. Sun thanks him for saving his life twice, and begs him to live for his sake should he die in that moment. As the soldier prepares to shoot Sun, he shocks the man. However, before Agni can move in, the three of them notice the snow beginning to pick up before getting caught in a massive avalanche. When Agni emerges from the snow, he finds Sun is nowhere to be found. He begins calling for the boy as he digs through the snow. After a moment, he finds Sun's arm sticking out of the snow. After rescuing him, he states that the boy's safety was merely a chance, as he happened to land near him.
39;t his dear sister and that she died years ago.
The next day, Sun continues to follow Agni, despite the latter's protests. While Sun goes to the bathroom, Agni leaves him behind to continue his journey. However, Sun catches up to him again with the help of a woman named Judah. It is quickly revealed that Judah is actually a soldier from Behemdolg, and decapitates Agni before swiftly cutting off her own arm to keep from burning, displaying that she also has a Regeneration Blessing. To prevent Agni from recovering, Judah orders her fellow soldiers to shoot his head regularly to slowdown his abilities while she goes to get a fireproof cloth. As Judah picks up her charred arm and removes her helmet, Agni is shocked to see that she has an uncanny resemblance to Luna. As they wait for the cloth to arrive while shooting Agni's head, he tries to remind himself the woman in front of him isn't his dear sister and that she died years ago. When one of the soldiers runs out of ammo, Agni used the opportunity to spit a bullet at them, setting them ablaze, giving him enough time to regenerate his body and attack the remaining soldiers. However, just as Agni was going in for the kill, he's immediately struck with a blast of fire from Doma who, due to a mental illness he's developed, is unable to recognize Agni. In his vengeful rage, Agni repeatedly charges at Doma, but is continuously knocked backwards by the forces of the latter's flames. Frustrated, Agni screams at Doma for killing his sister only for the latter to state he didn't ask him about that but if it was really him who killed Luna to which an enraged Agni attempts to strike Doma again, but is once again pushed back by the flames.
Doma asks what he can do to atone for killing Luna, apart from his own death. Despite his surprise at Doma's pleas, Agni still attempts to attack him. It is later revealed that Agni's body has been reduced to ash by Doma's attacks, but still he regenerates. When Doma pleads for Agni to forgive him, he asks the former if he still remembers his name. After being weakened by another attack, Agni is decapitated again and his head is wrapped in fireproof cloth and placed inside crate to be put on a train headed for the sea, where the soldiers intended to dispose of him. Fortunately for Agni, the train is disabled en route by Togata and Neneto, who steals the crate that Agni's head is in. The crate is blown up with explosives, and Agni's head falls into the water, where he regenerates. Shortly after, the trio encounter Judah, who Togata had defeated on the train prior to liberating Agni. When Agni asks if she is his younger sister Luna, as she looks and sounds exactly like her, Judah states that she has been alive for one-hundred and thirty years so she cannot be his sister. Afterwards, Togata decapitates her and tells Agni they should kill her. Despite Agni pleading with her not to do so, she takes Judah's head and tries to drown her. After chasing Togata around, Togata states that she wants to make a deal with Agni: In exchange for leaving Judah alive, Agni has to be the lead actor in the movie she is filming to which he reluctantly agrees.
Without Luna, Agni had nothing to live for. Upon hearing Luna's last words, he had to find something strong enough to keep him going so he cultivated his hatred for Doma, convinced himself he hated him and wanted him dead. To achieve this new arbitrary goal he had to become a being capable of it. That alter ego is commonly referred to as Fire Punch. He's often portrayed with a disfigured face. Fire Punch is first eluded to in chapter 20, when Agni starts seeing visions of himself on his way to kill Doma. I know that even if I kill Doma, Luna won't come back. Finally I forgot I was acting. His true entrance at the end of chapter 45. As Agni thinks about the trauma and pain he had to endure throughout the year, he imagines his sister asking him to kill Doma for her. Upon hearing her request to be Fire Punch, Agni disfigures his face and becomes Fire Punch. The following appearance is chapter 59 when kills Behemdorg refugees posing a threat the life of the girls he lived with. Especially Luna's (Judah). In this instance he lights his face on fire with a torch. During Neneto's attack on the facility Agni and the girls were living, Agni had to face the masked man. After being brutally sliced and pinned to ground with metal rods, he musters enough strength to stand up.