Kamyu is the second princess of Onkamiyamukai, a race of angel-like people who act as priests and peace-keepers for the land, and she is also the younger sister of Urtori. She befriends Aruruu, Yuzuha, and Mukkuru, and is often seen playing with them. Sometimes, during a full moon, another personality overtakes Kamyu. It is vampiric and has a strong sexual desire.
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.
Yui is very active and expressive. She's a bit small, but she holds ranks in Karate, and even won tournaments when she was in middle school. She absolutely loves cute things, and her room at home is filled with fancy items. She always ends up insulting Aoki when he tries to approach her. It is revealed that Yui was almost raped in middle school, thus starting to suffer from androphobia. Taichi helps her get rid of this phobia after she tells him about this incident. She has rejected Aoki numerous times, but in his latest confession, she admits she is just not ready yet to have a relationship. (Source: ANN)
Himeko is vice president of the Cultural Research Club. She excels in gathering information and analysis, possessing private data on each of the club members. She's calm and logical, but she's actually a bit clumsy, so her difficulty with roundabout phrasings causes her to surprise many of those around her with her blunt statements. It's revealed that she's actually a very sensitive girl, and scared of losing or hurting her friends. She starts dating Taichi in volume 4. Taichi describes their relationship as "platonic," and they mean to be soul mates. Himeko has even tried on rings with him while on a date.
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)