Centaur

The Centaur (ケンタウロス族, Kentaurosu-zoku) are a demi-human liminal race with the upper body of a human attached to the body of a horse. Herbivores, centaurs are normally found in grasslands and savannas, and are a race of nomads who become brave warriors in times of conflict.

Their civilization is ancient, by far the oldest of all the humanoid races known to mankind. Extremely proud and strong-willed, they differ from the other races in that they can characteristically consciously suppress their urges during mating season.

Culture
For centuries, Centaurs were a violent, militaristic race that lived around the art of combat. While Centaur males developed into being muscular, vulgar, violent beasts who only saw raw strength as valuable, Centaur females favoured technique and became refined, though prideful, warriors.

A polygamous marital culture, in order to continue their warrior culture, Centaurs mated with only the strongest of their race to ensure strength in the next generation, however, as the Centaur males became more crass; with minds only for building their strength, Centaur women began disliking the notion of "relations" with their male counterparts and turned to looking for more visually palatable men, such as humans, and this change in taste began to cause the centaur birth rate to dwindle. In order to overcome this problem, at least one generation ago centaurs started using 'Teaser Males' to aid in reproduction; where, during intercourse, the female would be sexually teased, or enticed, by a male that she desires as a mate, then the male Centaur mounts her when she is sufficiently aroused.

These 'Teasers' are chosen from a stock of cultural exchange student applications. While perusing the applicants, the Centaur women would give preference to the applications of the men they find visually pleasing. From there, upon the exchange student's arrival, the women would engage them in a courtship that would ideally lead to them becoming their 'Teaser'. The Centaur men do not seem to notice or care that their harem wives are taking on these 'Teasers/Lovers'.

However, not all Centaur women wish to engage in this form of relationship either and instead simply claim disinterest in reproduction; embarking instead in search of a "noble lord" to "serve" as their ancestors once did long ago. However, even these women may become forced to at least join a harem so that their familial line may continue.

Apparently, modern centaurs have stuck with breeding with their own kind in the traditional belief that doing so will keep their race strong, in opposed to mating with other species (humans in particular). For them, a position in opposite to this would require hard evidence to prove otherwise. Centorea's mother in particular set out to prove this by duelling her own daughter, because Centorea is actually half human. By duelling her mother, an undefeated champion jouster of the strongest lineage to a standstill, Centorea unknowingly proved that not being full centaur would not dilute the races' strength as a whole.

Physiological Attributes

 * Female Centaurs have large breasts for feeding their young, which are larger than human babies and require more nutrition.
 * Female Centaurs can lactate and produce a larger amount of milk. However this is rarely seen outside of pregnancy.
 * As herbivores, centaurs generally have twice as many taste buds as omnivores (e.g. humans), while omnivores have over twenty times as many taste buds as carnivores (e.g. Lamia).
 * Centaurs have a standard body temperature of 38 degrees Celsius, like horses.
 * While possessing mammary glands like humans, centaurs and centaurides possess equine genitalia, located on their animal half. While the variance of genitalia can presumably make cross-racial intercourse difficult, the equine vulva and vagina are the same in form and function as a human/humanoid's when compared side-by-side (with the same areas of pleasure receptors as a human and a larger clitoris that enlarges further during arousal and intercourse), with the only exception being that an equine's cervical area within the vagina can optionally extend itself back at further lengths than a human/humanoid's vagina to accommodate for the size of an equine penis. As such a centauride can easily engage in pleasurable intercourse with a human/humanoid and become impregnated by their human partners with no biological deficiencies in the offspring. It is unknown whether a human/humanoid female can safely have intercourse with and become impregnated by a centaur, however, as the size of a typical equine penis of adult size is thought to typically exceed the internal capacity of the human vagina (although due to the human vagina's degree of elasticity, it may be possible to achieve penetration and intercourse after a certain amount of preparation has been applied beforehand). Legends do exist where penetration and impregnation between centaurs and human females have happened.
 * A Centaur's ears are capable of reflecting the centaur's mood as they are able to move much in the same way as a horse's ears.
 * Much like horses, it seems centaurs only sleep lying down for REM sleep, which they need very little of. The rest of the time they go into a light sleep while standing or sitting from which they can wake up easily in case they get attacked and need to run. Also like horses, centaurs tendons and muscles possess the ability to "lock" to prevent fatigue while sleeping when they are standing or sitting upright.

Lightweight Centaur
Lightweight Centaurs (軽量種), known also as Racing Centaurs, are a Centaur subspecies that excels at running. They are smaller than standard centaurs, with slimmer and tighter bodies. Though they approach their rank and records with a stoic attitude and love running, they are easily injured, and they devote much of their attention to studying health care. They can be rather moody, but this can be attributed to timidity or physical and mental innocence. Since their bodies are not as large, neither are their breasts.

In times in the past, lightweight centaurs likely served as scouts and messengers, but would likely simply perform delicate work like tailoring or peddling in modern times. Given their necessary attention to health care, lightweights probably also serve as doctors and therapists for the community, as well. These centaurs have only standard breasts, and would make heavier use of dairy breed centaurs as wet nurses than the other species do.

Tsen is a Lightweight Centaur.

Dairy Breed Centaur
Dairy Breed Centaurs (馬乳種) are a Centaur subspecies that produces an exceptional amount of milk. Among the already well-endowed female centaurs, Dairy Centaurs have particularly large breasts. Because of this, they often serve as wet nurses for other centaurs who have trouble producing milk (like Lightweights), and due to this, it is common for Dairy Centaurs to live among groups of other centaur subspecies. Though they are about the same size as standard centaurs, their waists and legs are especially thick. Dairy centaurs are easygoing and meek. Their maternal instincts are strong, and they love small things.

Heavyweight Centaur
Heavyweight Centaurs (重量種) are the most muscular of the Centaur subspecies. They are so powerful that they can move around unimpeded even while wearing heavy armor. However, since they rarely have opportunities to wear armor in modern times, they apply their strength to farming and agriculture. They are the largest and most muscular of the centaurs, and their legs are far thicker than those of other centaur subspecies. However, most are gentle, good-natured, yet absent-minded and they are often dim-witted.

Shaia is a Heavyweight Centaur.

Unicorn
Unicorns (ユニコーン) are a demihuman subspecies of Centaur that have had myths and legends written about them since before Greecian antiquity. Known as a symbol of virgin purity, Unicorns are said to be "only tamable by virgin women". It is said that their horns are able to cure all diseases, with the resulting rumor resulting in a mass hunting for the species. Hunters usually used the species' fondness for virgin women to lay traps to capture them and harvest their horn.

Keros is a Unicorn.

Nightmare
Nightmares are a demihuman subspecies of Centaur that can enter the dreams of sleeping individuals and create nightmares, however if the individual is awake they have to use hypnotism to put them to sleep.

Nightdrem is a Nightmare.

In the Manga

 * Centorea Shianus (Centaur)
 * Centorea's Mother (Centaur)
 * Alusia (Lightweight Centaur)
 * Nightdrem (Nightmare)

In the Game

 * Keros (Unicorn)
 * Tsen (Lightweight Centaur)
 * Shaia (Heavyweight Centaur)

Trivia

 * A female Centaur is known as a "Centauride". Despite their bestial appearance, they are known for their beauty in ancient Grecian writings.
 * Members of this race consider it an unspeakable insult for a man to tire first during mating, and would be so insulted, they may kick her partner to death without another word.
 * One of The Eight Brothers is dating a Centaur girl.
 * Centaurs do not wear any undergarments.
 * A Centaur will only allow his or her master ride on their back as forcibly riding a centaur is the same as rape.
 * Centaurs use horseshoes for currency.
 * Centorea Shianus’ family is known amongst the centaur race as one of the bravest and strongest family lines.
 * According to Centaur law, duels must take place without armor.
 * Amongst the centaur females,, a centaur male famous for his wisdom and training several heroes of ancient Greece, has been the most highly idolized male centaur for generations.
 * According to Polt´s announcement in Chapter 29, before the duel between Centorea and her mother, the population of the Centaurs is more than thirty million.
 * Since Centorea has the appearence of a normal centauride despite her semi-human lineage, it can be assumed that centaurs genes are dominant. It is currently not known what a male centaur would look like if born between a human and a centauride, but it can be assumed that he would have looked more human than the beast-like appearence of the other male centaurs.