The ancestors of the Tohno family were local landlords of the area, as well as demon hybrids. The blood of those within the Tohno family have the blood of Oni (鬼, ?) mixed in with their own. The latent powers and abilites of the Tohno family is vastly superior to that of others. The blood itself is a blood from ancient times, and it causes individuals to give priority to their instincts rather than their reason.
In regards to their blood, there are those with strong and those with weak nonhuman blood. Those with weak nonhuman blood can live their lives as ordinary people, but those with strong nonhuman blood can never live a normal life. Those with especially strong Tohno blood are born with special powers. One such power that emerged from strong nonhuman blood was a body that is resistant to death. Other known powers included an ability to move things without touching them and fangs that could be used to take bodily fluids from other people.
When this blood becomes too strong, the members of the Tohno House start to gradually lose their sanity and some of them will change their appearance. The majority of the members of the Tohno House that lose their sanity become demons that feed on human flesh. As a result, the head of the Tohno household carries the responsibility of punishing those who have turned into such monsters.
The Tohno clan have been regarded as traitors because of the actions of the recent family head, Makihisa Tohno. Acting as a spy against an organization that terminated evil demon hybrids, Makihisa took control of the company and betrayed the head of the Saeki Financial Group, who had become Crimson Red Vermillion and already killed more than 1,000 people, to the Demon Hunter Organization. In response to Makihisa's information, the Demon Hunter Organization sent Kiri Nanaya to kill the Saeki and all of his 30 relatives who guarded his place. Using a simple rod similar to a drumstick, Kiri accomplished the task of killing almost the entire family of the half-blood line. As he witnessed Saeki's death, Makihisa feared the power of the Nanayas and concluded that the entire Nanaya clan would needed to be eliminated.
- Makihisa Tohno, the father of Akiha Tohno and SHIKI Tohno and the adopted father of Shiki Tohno.
- Akiha Tohno, Makihisa's daughter who succeeded him as the head of the Tohno family. She has the ability to interfere with the outside world, which is rare, even within the Tohno family. She can steal the life-force of all living beings within her sight through a cursed field of 'plundering'.
- SHIKI Tohno, Akiha's biological brother.
- Shiki Tohno, Akiha and SHIKI's adopted brother, raised by the Arima family for several years.
The Tohno clan has many relatives, who form the branch families.
Although related to the Tohnos, the Arima (有間, ?) family has very weak demon blood compared to the other family branches. The family consists of three people: Fumiomi Arima, his wife Keiko, and their daughter Miyako. They have a traditional Japanese household with a kendo dojo and a flower arrangement school.
Before the events of Tsukihime, Shiki Tohno had to move in with them because of his poor health, despite being the eldest son of the Tohno family. He lived with the Arima family for eight years before returning to the Tohno household. During those eight years, Shiki became friends with his non-blood related cousin, Miyako Arima, who continues to "protect" him even when he returns to the Tohno household.
The Kishima (軋間, ?) family is a branch family of the Tohno clan and they have a common enemy in the Demon Hunter Organization. Due to their thicker demon blood, they have superhuman abilities and are symbolized by burning flames.
The family's eldest son, Kouma Kishima, is closer to being a complete oni than any other member of the Tohno family. Because Kouma annihilated the entire family upon his awakening as Crimson Red Vermillion, he is also the head of the Kishima family. To ensure the destruction of the Nanaya clan, Makihisa brought Kouma along as insurance and found Kouma's work exceeded his expectations.
The Touzaki (刀崎, Tōzaki?) family are blacksmiths who temper weapons. When the time of a real battle comes, they cut off one of their arms and create a blade out of their bones. The bone that becomes their final and greatest work has similiar characteristics to the continent's legendary hazanken (sword that destroys the mountains).
The Kugamine (久我峰, ?) family is the branch of the Tohno family that has the most influence out of all the subfamilies, but they barely carry any demonic powers. Their strength is economical, and so they have a say in about a third of the Tohno family matters that concern a corporation. For that reason, even the Tohno household can't afford to mistreat the Kugamines, and especially its current head, a perverted fatso called Tonami Kugamine, who was Akiha's fiance until very recently. He has many problematic habits, no personality traits, and while he was staying at the Tohno house, he is said to have bothered Hisui quite a bit.
 Tsukihime Dokuhon PlusPeriod - TSUKHIME Dictionary: Tohno [Family name], p.185
Tohno [Family name]
Suzerain of all the "demon hybrids" living in the region where Tsukihime takes place.
Perhaps because of their long history, the Tohno and all their numerous branch families are quite wealthy, and together make up a prominent business conglomerate.
Going purely by financial power, the Tohno are actually beaten out by the Kugamine branch family. However, to these people blood is more important than anything else, and as the inheritors of the most precious blood of all, the Tohno family naturally fell into a leadership position.
Allegedly, they are the descendants of a powerful family that intermingled with oni (not kishin – humans that became oni – but actual, born and bred oni) and ruled the land for generations.
 Tsukihime Dokuhon PlusPeriod - TSUKHIME Dictionary: Arima [Family name], p.175
Arima [Family name]
An offshoot of the Tohno family. Of all the branch families, their Tohno blood is the thinnest.
The father's name is Fumiomi, the mother's name is Keiko, and the eldest daughter's name is Miyako.
They took in Shiki when he was nine years old. Their home includes an Ikebana classroom, and something that may or may not be a Kendo dojo. The picture below is of Keiko.
 Tsukihime Dokuhon PlusPeriod - TSUKHIME Dictionary: Kishima [Family name], p.175
Kishima [Family name]
An offshoot of the Tohno family.
Despite being a branch family, their oni blood runs even thicker than the Tohno's, and Tohno Makihisa enlisted the aid of the current Kishima family head during his assault on the Nanayas.
Although combustion is generally assumed to be Akiha's power, she actually possesses the power of freezing. The power of scorching heat sleeps within the blood of the Kishimas, and it is said their family head will certainly become a Crimson Red Vermilion.
The person that Nanaya Shiki met in that red meadow was the Kishima family head.
 Tsukihime Dokuhon PlusPeriod - TSUKHIME Dictionary: Touzaki [Family name], p.185
Touzaki [Family name]
One of the Tohno branch families.
Known as the Bone Masters, they temper their own bones into swords.
Though normally swords are forged from iron, the Touzaki present their own arms upon meeting a worthy recipient, and craft them a sword from the bones.
Their final and greatest work as blacksmiths is a bone sword with qualities that are superficially similar to the legendary mountain destroying sword of mainland China.
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