Some characters in novels must read comics. Stieg Larsson tells us how the Girl with the Dragon Tattoo got her nickname, "Wasp," but David Lagercrantz tells us instead that she named herself after the Marvel Comics Wasp.
In Alan Moore's Jerusalem, a boy growing up in Northampton in the 1960s reads about:
Iron Man battling Kala, the Queen of the Underworld;
Spiderman fighting the Vulture;
Superman and Batman meeting when young;
the Human Torch;
Starro the Conqueror;
the Baxter Building;
the Fortress of Solitude.
He reads Strange Tales, Fantasy Masterpieces, Fantastic Four and Thor with "Tales of Asgard" by Jack Kirby.
I remember the Skulls, Starro and the regular Superman-Batman team-up in World's Finest Comics.