Ri Seiryuu, who is found on a little rescue boat, along with another shipwrecked man, is more than just a cast away. Rescued as a little boy, by a fishing boat, the crew as well as the captain notice that something is wrong with the boy. He never smiles and behaves odd towards others. The Captain of the fishing boat decides to try an experiment with the boy. Until he smiles, he is not allowed to get out. Seiryuu is forced to live seperated from the crew. The room, he gets locked up in, is small but full of books, a TV and videos. Information about mankind and how it behaves on the planet. He grows up in a room filled with knowledge about killing, destroying and hate, and is kept there until his body has matured.
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)
In the anime, it is revealed that Maira, a former Pawn, became a Bishop by gaining the ÄRM Vaqua. He is not given a backround in the manga. Maira is a black-cloaked masked man who takes pleasure in engulfing and digesting people with Vaqua. Vaqua is a blue/green slime-like Guardian ÄRM with one eye. Maira is first seen watching the War Game battle between Ginta Toramizu and Garon. During the second round of the War Games, Maira reappears as a fighter for the Chess Pieces. He has the last of the battles in that round, and goes up against Dorothy. Maira is quick to falsely judge Dorothy's power, though he easily destroys one of her weaker Guardians and stalemates another. Dorothy, however, calls back this one to bring about her favorite, Toto, which eats Maira's Vaqua. Maira, now ÄRM-less, begs Dorothy for mercy. Dorothy, however, doesn't do as such and has Toto eat Maira as well, becoming the first casualty of the War Games.
A member of Arc Aile who, like Cisqua, chose to use weapons rather than Edel Raid, Maina is an old friend of Cisqua. She appears in an episode of the anime to bring Ren back to HQ as the main Arc Aile trio uses the disguise of a vacation to help find Edel Garden. It turns out she was controlling a Sting Raid that was attacking people on the ship through song, but in the end Cisqua uses the song against her and has to kill her to prove her dedication to Ren. Cisqua also claims that Maina is the better sniper, but worse at everything else.
Maina is the mother of Moena and part of Angel Blade.
Satsuki went to the same elementary school as Misuzu, and is a girl that knows about Misuzu's past. She continues to harass and tease Ayumu and Misuzu, but what are her true intentions...?