Main Characters

A high school student with a charismatic and helpful nature, he lives with his mother who has separated from his father due to marriage problems. He has two close friends, Haru and Furuichi. After a suicide bomber from the religious cult of Ruikonism detonates herself on his school bus, releasing the seven beings in a green egg inside her, they fly off as bright pulsing lights one of which lands on Akiyuki's arm, absorbs itself under his skin, and materialises as a blue gem-like object on his right biceps. As the bomber is dying, she touches his forehead, making first a small red gem appear, then a white and green mask. Within moments, Akiyuki's entire body transforms into an exotic white creature and engages in battle with a humanform weapon which attacked the area around the bus shortly after the bombing. Following his successful defeat of the humanform weapon, Akiyuki is subdued by a mysterious woman named Nakiami, who threatens to let him turn to stone if he does not go with her to the airship Zanbani where he must learn to coexist with the being within him. The blue gem-like object on Akiyuki's body, which has now moved to his forearm, is later revealed to be manifested appendage of an endosymbiotic organism

Endosymbiont

An endosymbiont is any organism that lives within the body or cells of another organism, i.e. forming an endosymbiosis...

 referred to within the show as a "hiruko

Ebisu (mythology)

Ebisu , also transliterated Yebisu or called Hiruko or Kotoshiro-nushi-no-kami , is the Japanese god of fishermen, luck, and workingmen, as well as the guardian of the health of small children...

". When a hiruko endosymbiont merges with a human, the resulting combined life form is referred to as a "Xam'd".

A mysterious and fairly unemotional woman, Nakiami makes her first entrance when she jumps in and subdues the enraged Xam'd, turning him to stone and demanding that he come with her and live, or die. Akiyuki accepts, and she knocks him and Haru unconscious with a few small movements. She then takes Akiyuki back to the ship with her, and starts operating on Akiyuki and working with his condition. At first, she needs to continually remind Akiyuki to "keep thinking", as this is the way for him to both improve his symbiotic relationship with his hiruko and to help prevent him from turning to stone. Nakiami is a fairly serious and skilled person, who bears similar face marks to other mysterious characters related to the Xam'd, and seems to have a lot of knowledge and expertise about it. She is a member of International Postal Ship Zanbani's crew and flies a small jet-like vehicle called a Beat Kayak. It has been noted that her character design and vehicle both share large resemblances to Nausicaä

Nausicaä (character)

is a fictional character from the science fiction manga series Nausicaä of the Valley of the Wind, created by Hayao Miyazaki, and the anime film by the same name, which was directed by Miyazaki...

, and it may have been an inspiration for her character. Tenshin-sama has given her the nickname "Cloud Rider". It is mentioned some time in the first few episodes by Ishuu Benikawa that Nakiami is not her real name and was just made up by the crew of the International Postal ship Zanbani after hearing Ishuu Benikawa yell at her to stop crying.

Haru is a fellow high school student and a friend of Akiyuki's, and fairly skilled in martial arts. She is the first to encounter Xam'd on the destroyed bus, and later realises the connection between Xam'd and Akiyuki. After Akiyuki is taken to the Zanbani, Haru corresponds with him via written letters. She later joins the Mainsoul military section in the hopes that it will grant her an opportunity to rendezvous with Akiyuki. Her strong desire to be with Akiyuki places a strain on her friendship with Furuichi. She later reveals to Furuichi that she loves Akiyuki.

Sentan Island

Furuichi is a friend of Akiyuki, and like Haru, practices martial arts, although it seems that she is much better than he is. Unlike Akiyuki, Furuichi is slightly more cynical and serious, although he is playful enough to bet with Haru on whether Akiyuki will be late or not. Furuichi joins the Mainsoul military, and demonstrates great skill in fighting Xam'd, whilst his relationship with Haru drifts apart. As a result, the reunion of Akiyuki and Haru is interrupted by him and he declares his intentions of killing Akiyuki, due to his cold indifference over the identities of Xam'd. Furuichi later volunteers to undergo an 'enhancement' program to make himself a better Mainsoul pilot, the result of which, ironically, causes Furuichi to turn into one of the opponents he was training to fight, a Xam'd. Furuichi's hiruko resides within his right thigh. Fueled by his anger and jealousy towards Akiyuki, Furuichi's hiruko causes him to continue to become more grotesque until he is subdued by Akiyuki and turned back to normal by Nakiami. He is captured by the Mainsoul military, but escapes while being transported to the base. Soldiers confront him while he is buying drinks for himself, his "beloved" Haru, and his best friend, perhaps finally accepting and coming to terms with Akiyuki. He then decapitates himself with his Xam'd arm before the soldiers are able to recapture him, saying that he wasn't meant to be.

Haru's younger sister who, as a result of being struck in an automobile accident two years before, requires a crutch to walk. The car accident also took her mother's life. She is later turned into a human-form.

Akiyuki's Mother. A strong-willed woman who cares deeply about her son and her, typically, overworking husband. Although the relationship between husband and wife is strained because of his frequent absence from the household, she continues to at least speak with him for the sake of their child. Upon discovering that her son Akiyuki had gone missing, she strongly resolved to try and find him, regardless of whether or not her husband was compassionate enough to abandon his work to help her. She has a very familiar relationship with Haru, and seems to be able to entrust his well-being to her, when later she was able to confirm that her son is indeed alive.

Akiyuki's father and Fusa's estranged husband. He's a local doctor for his community and appears to specialize in geriatrics

Geriatrics

Geriatrics is a sub-specialty of internal medicine and family medicine that focuses on health care of elderly people. It aims to promote health by preventing and treating diseases and disabilities in older adults. There is no set age at which patients may be under the care of a geriatrician, or...

, as he often treats the elderly of the area. He appears to be an unkempt man as he often shows little concern for the cleanliness and appearance of both himself and his clinic. His family often comes to his office to take care of him, such as by doing his cooking and laundry. He seems to care more about his work than his wife and son, and was one of the last people to know about the disappearance of his son after the island was attacked, and acts rather despondent vis-à-vis his impotence in keeping his family together. It seems that he has a troubled past as a military researcher who worked on Northern Continent humanform weaponisation projects and now deeply regrets his involvement. He also still has ututu seeds with him that he has not parted with, even after the end of his involvement with the military. The full extent of his involvement in humanform research is not yet known. Using life support

Life support

Life support, in medicine is a broad term that applies to any therapy used to sustain a patient's life while they are critically ill or injured. There are many therapies and techniques that may be used by clinicians to achieve the goal of sustaining life...

, he has been keeping alive the attempted suicide bomber whom was responsible for his son being implanted with a hiruko.

Zanbani Postal Airship

The captain of the International Postal ship Zanbani, she always wears a crop top

Crop top

A crop top is a T-shirt or blouse with the lower part cut off, showing of some of the abdomen. The half shirt is a kind of shirt that is cut off from the bottom of the chest....

 with diaphanous sleeves and usually ties her hair in a ponytail with a yellow ribbon. She also wears glasses, which she at one point blames on age, and is tall. She is described as being the "sweet, raven haired beauty with glasses" by Ahm despite the fact that she usually makes the off-hand comment that he is ugly, fat, or both. She's strong willed, independent and usually ends up spending her spare money on weapons and ammo. Half of the time she seems to be drinking and smoking. In disciplining her crew, she has been known to slap them depending on how stupid she thinks their actions were. Although she may have a tough exterior, she does occasionally have a soft spot for her crew.

Raigyo recently returned to the ship Zanbani after a two year journey wandering the world as a photographer and a vagrant. During his two-year journey, he had carried his possessions upon his back covered with a sheet, giving him an almost turtle-like appearance. Like Akiyuki, Raigyo is also a Xam'd, except Raigyo's hiruko resides within his left shoulder. Unlike Akiyuki, Raigyo appears to have greater control over his ability to change between human and Xam'd form and thus, seems to have a better relationship with his own hiruko. He also seems to have enough control that he can prevent himself from turning to stone, a common side effect that occurs in people imbued with hiruko. His Xam'd powers seem to be related with water, as water covers his body during his transformation, giving him the ability to swim fast and create water blades sharp enough to easily cut a humanform in two. His Xam'd form also has amphibian characteristics, like webbed hands. Tenshin-sama has given him the nickname "Wind That Stirs the Water".

Akiyuki's roommate aboard the Zanbani, he is proud of the speed he can physically run as a courier. He has a collection of pin-up girl

Pin-up girl

A pin-up girl, also known as a pin-up model, is a model whose mass-produced pictures see wide appeal as popular culture. Pin-ups are intended for informal display, e.g. meant to be "pinned-up" on a wall...

 magazines and centerfolds and also has a crush on the only female close to his age on the ship, Nakiami.

Responsible for the galley

Galley (kitchen)

The galley is the compartment of a ship, train or aircraft where food is cooked and prepared. It can also refer to a land based kitchen on a naval base or a particular formed household kitchen.-Ship's kitchen:...

 of the Zanbani, she is the mother of and acts as a mother for , who also live on the ship. Ishuu talks with her at times to either vent her feelings or just ask for another's opinion.

The pilot of the Zanbani who also operates the main cannon. He tries to act as a father figure for Hinokimaru whose real father died in "the Northern Sector".

Mechanic of the Zanbani who rarely leaves the engine room. He believes that only Raigyo understands his "poetic soul". More than likely, this is because Raigyo brings him the alcohol he prefers.

An old sage living aboard the Zanbani, who acts as a guide for Nakiami, Raigyo, and Akiyuki. She rarely leaves her quarters and often keeps both of her eyes closed, occasionally opening one eye when speaking. Her closed eyes are perhaps a medical condition as Raigyo, upon his return, gives her "Eye medicine, carefully prepared, taken from the Shitogi Grassland.".