Cookieboy 2005 (in-universe)
From Jenny Everywhere Wiki
"Cookieboy 2005" was an entity who created comics featuring Jenny Everywhere. According to one account, they existed in the Third Universe. (COMIC: Jenny Says: Drink Gevity™!)
Biography
Promoted by Jenny Everywhere
In one universe, a version of Jenny Everywhere once held a large sign promoting that "Cookieboy 2005" would be posting new comics to ComicFury. (COMIC: A Bit of Self-Promotion)
Promoting Gevity™
Cookieboy 2005 once released a comic to a website, featuring a version of Jenny Everywhere promoting Gevity™, apparently having been paid a "large sum" of money by a sponsor to release the comic. (COMIC: Jenny Says: Drink Gevity™!)
Behind the scenes
"Cookieboy 2005" was, of course, an in-universe counterpart of the real world creator of Weird Tales featuring Jenny.