Patchouli Knowledge is a witch and resident of the Scarlet Devil Mansion from Touhou Project. She first appeared in The Embodiment of Scarlet Devil as the Stage 4 Boss and Extra Stage mid-boss. She later appears as a playable character in Immaterial & Missing Power, Scarlet Weather Rhapsody, and Hisoutensoku.
Patchouli is friends with Remilia Scarlet, and acts as resident librarian of her mansion. She rarely, if ever, ventures outside the mansion or the library, where she studies various tomes and grimoires containing advanced magic. While she is a natural born magician unlike Marisa Kirisame or Alice Margatroid, her physical condition is actually worse than that of an ordinary human, as she suffers from asthma as a result of her reclusive lifestyle. During the events of Embodiment of Scarlet Devil, she attempts to stop Reimu Hakurei and Marisa Kirisame from reaching Remilia, but her poor health prevents her from being able to properly cast spells that day. Later on, after Flandre Scarlet leaves the mansion's basement, she uses her magic to create a raincloud above the mansion to prevent Flandre from venturing outside, where she is more likely to cause unintentional mass destruction.
In M.U.G.E.N, Patchouli has been made by various authors.
This version of Patchouli is a four-button character that makes use of Fighting is Magic's style of gameplay, and as such, has the use of the Magic Meter similar to that used by Ralord's Twilight Sparkle and Applejack.
Hovering the mouse cursor over the Command Input icons will display text that refers to the inputs set in M.U.G.E.N's Key Config.
Icons encased in square brackets [ ] require the respective button(s) to be held down. Hovering the mouse cursor over the icon displays the hold duration if applicable.
After Flandre accidentally destroys another Nintendo handheld, RicePigeon's Patchouli decides to venture outside with a spellbook in order to take some frustrations out on anyone unfortunate enough to get in the way; while the character is armed with potent elemental projectiles, being holed up in a library for 100 years does do a number on one's health, which is reflected in the reduced Life stat.