* Youmu is often called "Myon" by fans, as she inexplicably asks Yuyuko why she is present at such a "myon" place in the PCB extra back story. ("Myon-na" is a portmanteau of　"hyon-na" (unexpected) and "myou-na" (strange).) Her ghost half is also sometimes called Myon; it's also occasionally referred to as an "option" (like the ship accessories in Gradius), but this is less common.



* It is generally accepted in fandom that Myon and Youmu are each able to sense what the other feels.



* Fanworks occasionally depict Youmu as idolizing Sakuya, most likely because they are similar characters; they are stage 5 bosses who use bladed weapons, have silver hair, eyes that changed colors from red to blue, and have power over time. In these comics, Youmu addresses Sakuya as "Onee-sama", a title usually used to refer respectfully to an older sister or to an older woman one respects or admires. Additionally Youmu frequently gets parodied crossing over with Jean-Pierre Polnareff of JoJo's Bizarre Adventure (a fast-moving sword stand-user), much like Sakuya and Dio of the same series.



* The characters for Konpaku mean simply "soul", and Youmu something like "bewitching dream".



* Although both "Kon" (魂) and "Paku" (魄) are "soul", their elements are different. "Kon" stands for a mental soul, which is separated from a body as soon as human dies and ascends to Heaven; "Paku" is a physical soul, which remains in the body a few days and goes back to the Earth. In this case, "Kon" is Youmu's ghostly half, and "Paku" is the human half. The entire Konpaku family is comprised of half-ghost half-humans, as noted by Perfect Memento.



* The kanji that makes up "Youmu" (妖夢) are also part of the kanji for Perfect Cherry Blossom (東方妖々夢).



* Her ghostly half is often treated in fanworks as "food" (usually eaten by Yuyuko). In Hisoutensoku this has gone farther; in her script, if she loses to Sanae, the latter asks her how "the marshmallow looking-like thing" tastes.



* In Phantasmagoria of Flower View, Youmu's name is written in Roman letters Japanese style, with her surname first, during pre-battle conversation with her, even though every other character in the game with a Japanese name has their name romanized western-style, with their first names first. This is one of several typographical inconsistencies in the game (another being the inconsistent spelling of Aya's name).



* Because of Youmu's spellcard "200 Yojana in One Slash", she is said to be capable of striking at speeds most would consider physically impossible (200 yojana can be a distance anywhere from 1,320-3,000 kilometers or 825-1,875 statute miles in length). In order to cover that kind of distance in the split-second a typical sword slash takes to execute, she would have to be capable of moving at far beyond hypersonic speed; her slowest sword slashes have been calculated to move at speeds in excess of Mach 70 (70 times the speed of sound, or 53,200 mph/85,120 km/h at sea level), fast enough to circle the entire Earth at the Equator in less than half an hour and around three times the speed required to orbit the Earth, for reference. One doujinshi (Touhou Kaidan Seven #2) went into far too much detail trying to work out the specifics of this, and determined that her theoretical top speed was approximately one quarter of the speed of light...



* During some of Youmu's spellcards, time appears to slow down while she performs her sword slashes. This is not due to any innate time-stopping power such as what Sakuya has; rather, it is simply Youmu moving so fast that relative time slows down for her (Einstein's special relativity theories hold that at extremely high velocities, time moves slower for those traveling at that velocity than for a stationary observer). For the record, moving at this velocity should vaporize her and her sword due to aerodynamic heating... thank goodness for magic.



* Her theme song is titled "Hiroari Shoots A Strange Bird ~ Till When?", named after a story in which a warrior named Hiroari slays a youkai known as the Nue. This is a pun on the storyline. The "strange bird" is a Nue, also called the "Itsumaden", since it makes this cry near unmourned corpses, meaning "How long (will this corpse remain unattended)?"

Judging from the story of Perfect Cherry Blossom, the heroine plays the role of Hiroari, Youmu is the Nue, and the corpse is probably Yuyuko Saigyouji. (See also Flandre Scarlet and Yukari Yakumo.)



* Ironically enough, considering her species, Youmu is afraid of ghosts, as shown in Imperishable Night's Extra Stage. After defeating Fujiwara no Mokou, Yuyuko pretends there is a ghost under a tree, earning a terrified shriek from Youmu.



* One of her colour palettes in Touhou Hisoutensoku makes her completely silver, a rather subtle reference to Silver Chariot, the stand of Jean Pierre Polnareff from Jojo's Bizarre Adventure, whom she parallels with.



* Youmu seems to have some knowledge of Chinese legend and history because of her particular win quote against Meiling, in which she asks why the latter does not wield Guan Yu's Green Dragon Blade. By the way, women didn't use polearms traditionally in Chinese martial arts.