The characters for Yagokoro literally mean "Eight minds", and Eirin "Eternal jewel". A genius pharmacist who once lived on the moon. Kaguya persuaded her to produce the forbidden Hourai Elixir—the elixir of life—and consumed it. They were found out, and Kaguya alone was punished and was sent to the Earth, a fact which Eirin always felt guilty about. Sometime later, the moon court pardoned Kaguya's sins and summoned her back. Eirin and a handful of emissaries were sent to retrieve her, but Eirin found out that Kaguya didn't want to return to the moon. Acting out of her past guilt, Eirin betrayed and murdered all the other emissaries under the eyes of the earthlings who had fostered Kaguya. Eirin bribed the earthlings with the Hourai Elixir, in order to keep them silent, and went into hiding with Kaguya in Gensokyo.
Sakuya is the only human living in the Scarlet Devil Mansion, yet she is also the head maid. The official fanbook suggests she had been a vampire hunter before she began working in the mansion, but she was defeated by Remilia Scarlet who pitied her and gave Sakuya her current name. Though she looks about sixteen like the other girls, Sakuya has the ability to slow, stop and possibly reverse time. She seems to have been serving Remilia for a long time and may be far older then she looks. Socially, she interacts mainly with the others in the Scarlet Devil Mansion. Her talents are cooking, knife throwing and time manipulation. The latter two abilities characterize her appearances in-game, and led to frequent parodies in reference to Dio Brando of JoJo's Bizarre Adventure, who also controls time and throws knives. This reference goes so far as Sakuya using some of his poses in a game. She is often associated with dogs by other characters because she is serving as a demon's "faithful guard dog" even though she is a full blood human. Due to the inconsistent artwork depicting her bust between games, d�jinshi often make fun of her by indicating that she pads her breasts. (Source: Wikipedia)
A tengu who has been in Gensokyo for over 1000 years, when oni were still around. Her origin is a crow. She has the ability to manipulate wind. Her character is honest but not rigid. She is polite to strong people, and deals more firmly with weak people. However, she is always polite when conducting an interview. Although her powers are among the top class in Gensokyo, she never uses them just to show off. This isn't only a characteristic of hers, but of tengu in general. She usually lives on a mountain where the wind always moves at the same speed and the same direction. She loves gossip and is always gathering information exchanged with her fellow tengu. During any exchange, information is warped, and almost all of their stories end up exaggerated. She is the biggest connoisseur of rumors about the girls of Gensokyo among the tengu. Through observing for herself and collecting information from colleagues, barely a moment passes when she isn't obtaining material. However, much of her material is mingled with rumor. She writes up her non-periodical newspaper, Bunbunmaru News, and distributes it among the tengu. It's a newspaper chock-full of rumors. As the current disaster started up, the tengu were overjoyed. There was much new material to be obtained, based on which they can write up their newspapers. (Source: TouhouWiki)
Arika is the protagonist of the series My-Otome. She is first introduced in the first episode where she travels through the desert to Windbloom to find out more information about her mother, whom she was told was an Otome. After seeing the power of the 3rd Column, Shizuru, she decides to follow her mother and become an Otome. She is sometimes nicknamed Anty (Arinko-chan in Japanese) because her name, Arika, could be "蟻ã�‹" in Japanese, which means ant. The way her head turns into an ant's head is a way to show how she feels when someone calls her this nickname (which must have followed her all her life). She is cheerful and optimistic, but lacks the sophistication and "common sense" to deal with the royalty (due to her being a country bumpkin). She quickly gets acquainted with the other Corals and Pearls in Garderobe and becomes good friends with most of them, mainly Nina Wáng and Erstin Ho, her roommates. She eventually acquires her mother's old Meister GEM, the Blue Sky Sapphire (蒼天ã�®é�’玉 SÅ�ten no Seigyoku) and creates a contract with the current Queen of Wind Bloom, Mashiro. At first she is unable to release it's full potential, but in episode 25 she finally obtains the final Robe of her GEM, the Ultimate Blue Sky Robe, that her mother once wore. In Mai-Otome Zwei, she still retains the incomplete form of her Robe when materializing, but can call upon her final Robe at any time through Materialization Zwei, a power unique to Arika. Her Element takes the form of a crystal spear and is called the Blue Sky Spear. Her main Element attack is called Bolt from the Blue, and the ultimate form of her Element is the Sword of Akatsuki. (Source: Wikipedia)
Miho Aihara (相原美穂) is Yuki Aihara's sister-in-law.