Wonderful Blessing: Belphegor, Demon General of Sloth, is the lead (and only) dev for the biggest (and only) gacha game in Generia, Clash of Legends, from which she derives much of her income.
Demon Soul Saga: Kanade Mishima is the lead actress to the popular show Tomorrow With You, a Time Travel romance drama for which she received great acclaim.
In The Gamer's Alliance, the Midnight Circus ends up performing William Veer's play The Merchant of Scundia to an Alentian and Sarquil audience. The majority of the actors are actually diguised demons who plan to use the play as a means to subtly affect the audience with their dark magic and turn them more violent in order to make Alent descend into chaos. Meanwhile the Sarquil merchant Javan al-Kassis who has become the demons' captive and has ended up directing the play because the demon infiltrators don't know how to do so, is trying to subvert the demons' plans in a subtle manner by trying to make a statement about the dangers of prejudice and talk about tolerance between different rances while he's playing the part of the demonic moneylender Cravenbolt.
It Makes A Sound is about the identically-named amateur radio show made by Deirdre Gardner, the nostalgic, still-devoted childhood superfan of local musician Wim Faros, and her quest to revitalize her declining hometown by helping it rediscover his music.
Julian the Janitor is a tremendous fan of the Orbiting Human Circus (of the Air) a radio variety show broadcast from a ballroom atop the Eiffel Tower, where Julian works. His fondest dream is to be Pushed in Front of the Audience and become on-air talent, which is why he bumbles onstage so often in an attempt to become Plucky Comic Relief, much to the staff's chagrin.
As a closing act, The Circus airs prerecorded spoken story segments as "featured presentations" within its own format. Episode 1 has "Goolsby and Rue" where an older Englishwoman tells of discovering that her mother's employers are cannibals.
Echo Chamber, the TV Tropes vlog about tropes. The audience never sees the finished vlog; we only see the "making of" aspect.
Characters are fans
Magical Princess Sailor Rose Wand (the exact name varies from use to use) in Sailor Nothing, a thinly-veiled spoof of Sailor Moon that apparently crams even moreMagical Girl tropes than the original (which, apparently, doesn't exist in the Sailor Nothingverse). Used to constantly compare "reality" to TV.
The SuperMarioLogan series has two regular in-universe TV shows - Charleyyy and Friends and Doofy the Dragon, respectively Bowser and Junior's favorites.
17776 uses the overarching plot about satellites as a sort of framing device to look in on humans in the titular year. One of the chapters is a transcript of Garbage Football, a podcast where two Caustic Critics mock bad football matches.
Farce of the Three Kingdoms has the gripping reality TV drama Real Concubines of Wu, which is popular in Wei and Shu. Unfortunately the narrator doesn't care about Wu, so all we see are Noodle Incidents.
Wonderful Blessing: Belphegor is a fan of various manga, such as Hermelin Ajin no Densetsu (a reference to the GM's other game Demon Soul Saga) and Hourai Densetsu (a reference to Chains of Horai).
Solrise Academy: Astrea is a huge fan of the manga Pretty Pretty Spark Kanade, which is heavily implied to be a Magical Girl manga.
Show is plot point
The Mushroom Kingdom News occasionally seen on There Will Be Brawl serves for dropping plot points to Luigi.
The play Thalia sponsors at the Pythian Games in Thalia's Musings. It provides a safe means of revealing Eros and Psyche's whereabouts, repenting to Aphrodite, and asking that Psyche be made immortal. Aphrodite and Hera take to the stage to grant both requests.
The characters of Marble Hornets were originally creating a movie called Marble Hornets. Finding out what happened while the movie was being shot is an important part of the plot.
