The Great Dog Demon was a powerful yokai lord who ruled the Western Lands and was known throughout Japan. Never formally addressed with a name, he fathered two sons by two different mothers: Sesshomaru from his consort, an unnamed dog demoness, and InuYasha from a human woman (unnamed in the manga, but named "Izayoi" in the third movie). The Great Dog Demon is first mentioned in chapter 12 of the manga as InuYasha's father, "a demon dog that prowled the lands of the west". The Great Dog Demon's major foe in the manga was the dragon Ryuukotsusei, whom he could not kill but sealed onto a cliff face with his claw; Myouga calls this battle the "cause" of his death. The gateway to his tomb is hidden in a black pearl (a mystical gem that creates a path between the mortal and spirit worlds) inside InuYasha's right eye. Within the pearl, their father's body is shown as an enormous dog skeleton in a suit of armor: his true form, according to Myouga. The sword Tetsusaiga, forged from the Great Dog Demon's own fang, rests inside this cavernous skeleton, protected by a barrier that repels any non-human with malice toward humans. Because of this, InuYasha inherits the sword rather than Sesshomaru.
Sanehisa is the older brother of Minamoto Yurihisa, Tradically he is killed on a mission with his younger brother, Protecting Yorihisa with his life as his last action. He appears most prodomiantly in episode 16 of the Harukanaru Anime & is mostly talked about only by his brother whom feels great guilt over his death.
A lunarian who is at least over 1000 years old who easily absorbs knowledge. She and her sister are currently in charge of the Lunar Defense Corps. She was formerly a student of Eirin, a medicine genius from the moon, who is now an exile and now staying with Kaguya on Earth in Gensoukyou.
Te no me is a small yokai of the Nura Clan. He has a weird-looking forehead and his eyes are located in his palms. As one of the yokai who travels with Rikuo to Kyoto, he spends much of the ride snacking and drinking sake with Ko Oni, Sannokuchi and Natto Kozo.
One of the Hachiy�, he is the Genbu of Earth. Yasuaki is an Onmy�ji, and the successor to the famous, historical Onmy�ji Abe no Seimei. Unlike his fellow Hachiyou, Yasuaki was not "born" a human, but created through Abe no Seimei's magical skill, and crafted into his current form through that same ability (in the manga he even talks about Seimei using a Tengu's power to help form him, although this is not explained in the anime). For this reason, despite having the physical appearance of a twenty one year old adult male, Yasuaki has only actually been alive for two years. This in many ways explains his emotional simplicity and naivety, since he has not yet learnt many of the things his companions have grown up absorbing. For the most part, Yasuaki is a composed, detached individual that operates largely on logic and is sometimes perceived as cold or strange. When it appears that Eisen will die if he exorcises the eight-stringed Kin, Yasuaki states the fact bluntly and without any concern because he sees it simply in black and white - to save the Miko, a Hachiyou must be prepared to do his duty. As he puts it - "If there is no Miko, there is no point in the Hachiyou." When Yasuaki was "born", Seimei told him he had been born to find someone important to him, and that he lacked something as a person - a heart - which could not be crafted. For this reason, Yasuaki has accepted his master's words as meaning he's not a "real person", and therefore does not count in the same way as his Hachiyou companions. He believes he is the Miko's "tool" - in the manga, he is worried that he is "broken" because he can no longer read Akane's heart (although Akane explains to him that that just makes him like every other person, and that he's not broken at all) In the anime he tells her that "a tool that no longer works has no option but to be destroyed" after Shirin tells him that he will never be able to find the Northern Seal. In the anime, his ignorance of human feelings make him tell Ran the memories that to that point had been concealed from her, driving her back to the Oni clan and causing a lot of trouble for the Hachiyou. In the manga, it is when he releases Kotengu's seal and sends him into battle against Ikutidaru, only to have the creature apparently slain at the demon's hands. Yasuaki has many odd habits during the anime and the manga - including talking to trees, possessing small animals to convey messages and even casting spell dolls to help him do the cleaning. Although undoubtedly the most powerful of the Hachiyou at the start, he is also probably the most vulnerable on account of his background and his origins. Yasuaki's developmental stages and childlike naivety are more clearly outlined in the manga, also - at one point, he asks why people tell lies, but later winds up lying to Akane himself to protect her from the grief of Kotengu's apparent passing away. This act tortures him for some time afterwards and he withdraws from Akane's company completely, convinced she must be angry with him for telling her a lie. Yasuaki's most commonly said phrase in the manga and the anime is (mondai nai - no problem), a catchphrase which was even picked up on and exploited in one of the live Haruka Matsuri festas. He also often says (wakaranai - I don't understand) - usually when relating to some human nuance that he hasn't managed to grasp yet.