Jenny Everywhere Wiki (in-universe)
The Jenny Everywhere Wiki was a website which described Jenny Everywhere and her lives from a perspective where they were works of fiction.
The website was sufficiently tied to the “real” Jenny as she existed elsewhere in the Multiverse that editing the Wiki altered Jenny's own nature, at least under some circumstances where reality was particularly fluid, such as April Fools' Day when the Rule of Funny was ascendant. Lord Grallyx attempted to take advantage of this on one occasion, editing the Wiki to attribute more powers to himself and defeat Jenny. However, Jenny proved quite capable to edit it back again, tit-for-tat, and ultimately none of Grallyx's victories lasted past that April Fools' Day. (PROSE: The Wiki Adventures of Lord Grallyx)
Behind the scenes
This is an in-universe counterpart of this very Wiki.