Dorii and Guraa are twin archers serving under Oboro. They are talented archers and often lead archer groups in Hakuoro's army. There are few ways to tell them apart. For one, Dorii has purple eyes while Guraa's are blue. Also, the bottom part of Dorii's clothes are blue while with Guraa they are red. You really can't make them separate characters since they're always side by side. They are somewhat androgynous, and as such their gender is difficult to ascertain, even by other characters. In the game, they reveal they are male, in the anime their gender isn't revealed.
Ditzy principal of the school. She is the one that allowed Takeru, Haruno, Inaho, and Himegami to all live under the same roof. She brandishes incredible power and control over element as she was able to break through amazingly powerful barriers, with her bare hands, thanks to nothing more than, in her own words, her "fighting spirit". She was in the maken-ki of the school before it became an all girl's school.
From Wikipedia: A genius blond-haired Akuma who recently got transferred to Tomoharu school and was put into his care from the Akuma hunt. Her family profession is to study the Asura Machina control systems. She's a Luck-eater, an Akuma that eats the luck of people and controls the balance between unlucky and lucky people. She was sent to study the Asura Machina that had absorbed the Stabilizer. She also came to Japan to look for her missing sister. After exident in 7th series she appeared in 1st Worlgв 5 years ago in the past and helped Naotaka and Ritsu in their Asura Machina research. She created Hagane and modified Kurogane for Tomo.
Student Number 31: Zazie Rainyday (ザジ・レイニーデイ, Zaji Reinīdei?) Birthday: 17 March 1989. The silent acrobat, and one of the most mysterious girls of the class. Nothing much is known about her, as she rarely associates with anybody, and even when she does, she rarely talks (she has spoken only eight times in the serialized manga thus far). What is known is that she is a member of the Nightmare Circus, the school's Acrobatic Club, and is seen directing a group of "monsters" or "spirits" (similar to No-Face from Spirited Away, the Angels from Neon Genesis Evangelion or possibly Hollows from Bleach) when she offered to cover for her classmates during the school festival, and gave Chao a tiny living dragon as a farewell gift. She also has been shown to see Sayo without the assistance of Negi or having a close relationship with her like Kazumi. According to Negi's Class Register, Zazie is also a member of the school's Magic Club, though whether this is real magic or stage conjuring is unknown. In the anime, she is shown to have proficiency in all kinds of circus tricks such as juggling, sleight of hand, and costume changing. She has dark skin, and has two particular face marks: a large teardrop under her left eye (strongly resembling the carnival character "pierro"), and a vertical line resembling a scar crossing the right side of her face. A splash picture of the cast shows her with claws growing from her fingers. She is sometimes seen with her pet bird, but more recently with her "friends" (the black spirit-monsters). So far, she is the least known of all the students in Negi's class and very little has been revealed about her. Zazie is one of the few students in Class 3-A who did not participate in Negi's sojourn to Wales and the Magical World. When Zazie's name is seen it is written in the Latin alphabet, rather than in Japanese. Similarly, Evangeline's name is also written with the Roman alphabet. This seems to indicate that, like Evangeline, Zazie isn't from Japan and is instead from a country which uses the Roman alphabet. This is backed up by the fact that Chisame referred to her as a transfer student in volume 2. (From Wikipedia)
Suika is the only oni currently living above ground in Gensokyo, with the remainder of the oni race living underground. Just as the folktales say, she has two horns on her head that symbolize her oni heritage, and enough physical strength to throw large boulders single-handedly. Her personality is jolly and quite childish as you would expect from her appearance. She also likes to drink and loves to party with all her heart. Her power in the games is to manipulate density. (Source: Touhou Wikia)
Candidate pilot. Karin is a quiet girl who seems to be distracted from reality and likes to text-message her cell phone. She is afraid of cats in general and is 15 years old. (Source: Wikipedia)
Lunar is a childhood friend and rival of Sun. She has used the powers of her mermaid voice to become a pop star idol singer. She seems to suffer from a superiority complex, and she never passes up an attempt to overshadow Sun. She initially thought that Sun was boasting Nagasumi to her, and in an attempt to outdo Sun she decides to steal him away from her by making Nagasumi her servant, since Nagasumi has also seen her mermaid form. Later she decides to live in Nagasumi's house until his servant status is over. (Source: Wikipedia)