Meta-awareness

Fourth Wall Awareness was one umbrella term for the ability of some individuals to perceive that what was real to them in their own universe was actually fiction on another level of reality.

Jenny Everywhere

Several instances of Jenny Everywhere have shown or hinted that they know they are fictional characters.

Jenny sometimes treated the worlds she visited as the creations of artists. (COMIC: Jenny Everywhere in Insert Comic Here)

Medium awareness was a central plot point of the Crossing Over of Worlds tale, itself a subset of the Crossover Wars project, in which various web comic characters were enlightened about their natures. (COMIC: Jenny Everywhere and the Crossing Over Worlds)

One Jenny explicitly introduced herself as an open-source superhero, to the confusion of her companion. (COMIC: Jenny Everywhere in Sob Story)

The Jenny who was a classmate of U.R. Hip was followed around by an asterisk hovering above her head, which directed readers to the standard disclaimer; other individuals occasionally remarked on the asterisk. (COMIC: The Asterisk Knows, et alt.) She was also able to receive fan-mail from a dimension where her and I.M. Hip's adventures were a webcomic. (COMIC: Road to Nowhere)

One Jenny never addressed the fourth wall, but arrived and departed from the dimensions she visited by interacting with the world as a comic — opening panels of said comic like doorways and stepping through. (COMIC: By the Book)

Another Jenny, seen above, shifted into an empty white void and concluded that an empty and featureless universe meant the author must be asleep. (COMIC: Jenny Everywhere in Insert Comic Here)

Yet another Jenny not only got told she was fictional but quarreled with her writer Sizemore. (PROSE: Paperback Writer)

The Jenny of the Infinity Apartment once demonstrated that she was aware of her adventures coming in the form of six-panel comic strips and of the passage of time as measured in panels. Thuban shared this awareness. Jenny even commented upon the creator experimenting with new art styles. (COMIC: Infinity Apartment)

The SCP Foundation briefly interacted with a Jenny Everywhere who warned them she could only stick around as long as it made for an interesting story. (PROSE: SCP J-Ev)

The Jenny Everywhere of the collapsed cosmos expressed awareness of her world being shaped by fictional narrative logic during her initial journey with Glendalf, although at the time she was in a state of reality she had entered through a book. (PROSE: The Hermetic Garbage of Jenny Everywhere)

One Jenny was so aware of her fictional nature that she edited entries on the Jenny Everywhere wiki. (PROSE: The Wiki Adventures of Lord Grallyx)

Others

Jenny Everywhere and Thuban discuss the format of their own comic. (COMIC: Infinity Apartment)

Jenny's friend Lex hinted at this, as he seemed aware that his adventures with Jenny Everywhere had an audience and that this audience's taste affected their fates to some extent. (COMIC: Damn Fine Hostile Takeover)

Fellback was an antagonist who claimed granting Jenny web comic awareness was a matter of "...giving you choice! Relieving you of your fate!" (COMIC: Jenny Everywhere and the Crossing Over Worlds)

Sizemore was a cruel writer who messed around with Jenny as one of his characters. (PROSE: Paperback Writer)

Thuban, one of the Jenny from the Infinity Apartment's neighbours and companions, was aware of his adventures taking the form of comic strips with limited numbers of panels somehow, much as Jenny herself.

Scale was a webcomic character created with fourth wall awareness, who would visit other comics in her original Cameo Comic series and later in other titles.

Lord Grallyx was temporarily aware of his fictional nature on April Fool’s Day 2022 when it became the basis of an adventure. (PROSE: The Wiki Adventures of Lord Grallyx)