Patchouli Knowledge and Koakuma, Two busty Librarians

Patchouli Personality She doesn't have a very proactive personality but rather always walks her own path. However, she's always interested where knowledge is concerned and will proactively go and try to acquire it. She does everything by the book but still makes a lot of mistakes. She's also described as very dark and taciturn, which in this case means she is introverted and silent in expression and manner.

While she's capable of using advanced magic with great power, her poor health, asthma, and anemia limits her ability to use it. During Embodiment of Scarlet Devil, she says "I can't finish reciting the spells because of my anemia!" and her condition limited her to using two-element spells. On another day, her asthma wasn't as bad and she felt better so she was able to cast three advanced spells in a row: a sun, a moon, and a five-element spell.

Fitting her magic to the same attributes as the days of the week is her secret hobby but nobody has realized this.[7] Thanks to this, she doesn't mistake the day of the week but oddly enough, she doesn't have a good sense of the date.

In Embodiment of Scarlet Devil, she had the peculiarity of using different spell cards depending on the player's character and shot type (a recurring gimmick in many stage 4 bosses of the Touhou games). Other than spell cards, she's able to use a revolving laser that focuses on herself as her regular danmaku.

Possessions Patchouli has many books in the library of the Scarlet Devil Mansion which are mostly used for magic. Some of these books appear to act "independently" and can shoot danmaku, as shown in Stage 4 and the Extra stage of Embodiment of Scarlet Devil. She also has waterproof books that Marisa finds interest in reading in the bath.[8]

Abilities Manipulation of fire, water, wood, metal, earth, sun and moon Patchouli manipulates the five Chinese elements, making her an "Eastern style Western magician", an antithesis existence to Marisa Kirisame: "Western style Eastern magician". Patchouli is able to handle the five phases (commonly called Wu Xing, sometimes known as the five elements) with the addition of the sun and moon elements. The order of elements she uses follows the days of the week on a Japanese calendar. Due to this, she's known as the "one-week girl".[4] In the Japanese language, the weekdays are named after the classical planets, which in turn were named after the Wu Xing phases (e.g. Mercury, water star), plus the Sun and Moon as heavenly bodies. As this ordering is based on the planetary hours, there is no direct relationship between the weekdays and Wu Xing. The ordering of Patchouli's elements follows the weekday sequence but places the Wu Xing phases first and "Sun" and "Moon" last.

Patchouli hair and eyes are purple and has many ribbons tied to her hair and other parts of her clothing. She wears pink pajama-like clothing and a night-cap with a gold crescent moon on it

Patchouli Knowledge is Remilia Scarlet's old friend.[11] In Perfect Cherry Blossom, they called each other "Remi" (レミィ) and "Pache" (パチェ) respectively. The two have been depicted having tea and casual conversations together in Silent Sinner in Blue and Oriental Sacred Place where Patchouli offhandedly commented that they're both creatures of the night. As stated in Perfect Memento in Strict Sense, Patchouli's role at the mansion is to solve problems and to cause them. Patchouli will often volunteer her services when she sees Remilia in need of them.[12][13]

Patchouli is unlikely to be formally employed by Remilia. Sakuya Izayoi referred to Patchouli as "The Mistress's magician friend" while talking to Rinnosuke Morichika about her[14] as opposed to any sort of employee title. She is referred to as Remilia's friend in other materials as well.

The head maid, Sakuya Izayoi is occasionally seen serving Patchouli. Patchouli tends to be rather sarcastic and condescending with her and Hong Meiling but seems to appreciate her as she always remembers to thank Sakuya for tea or for completion of other jobs. With Meiling however, she tends to tell her to read books to improve her brain. Koakuma is an employee of Scarlet Devil Mansion seen working in the library; any dialogue interactions between the two are unknown.

Not much is known about the relationship between Patchouli and Flandre Scarlet. Patchouli is aware of Flandre's existence and the need to keep her confined to the mansion. As Remilia noted, Patchouli was probably causing a rainstorm around the mansion to keep Flandre from getting out.

Koakuma

Personality she has a capricious, mischievous personality and doesn't think of consequences, similar in many ways to Daiyousei.[5]

Occupation Koakuma lives in the Scarlet Devil Mansion, and has been seen helping out Patchouli Knowledge in the mansion's library on multiple occasions.[3][6]

Species Koakuma is a devil - they are stated to be a powerful race on par with vampires and magicians, but Koakuma is the weakest among them, hence the name "little devil".[4]

she wears a black dress with white sleeves. She has a small pair of black, bat-like wings on the sides of her head and long red hair Koakuma has black pantyhose on