Simply put, the Flaming Devil is a representation of Satan with Camp Gay characteristics. While this type of villain may not be a demonstrable Depraved Homosexual, the implication is always clear. Whether or not he's particularly successful at villainy is irrelevant—in fact, he may even be Affably Evil—as long as he's effeminate and wicked.
The origins of this trope are Older Than Steam. Epicene depictions of Satan date back to the Middle Ages, in which folklore often described the Devil and his minions as having Ambiguous Genders and tempting men sexually. The homosexual implications in Christopher Marlowe's Doctor Faustus and overtly bisexual Mephistopheles in Johann Wolfgang von Goethe's Faust eventually codified the image of a gleefully evil and flamboyantly effeminate devil.
While this trope carries its own Unfortunate Implications (conflating effeminacy and/or homosexuality with evil), the Flaming Devil almost never appears in works meant to be taken seriously and is rarely the subject of audience complaints.
Compare Hot God.
- Daiou-sama from Dororon Enma-kun might count.
- Lucifer in Dawn: The Goddess is A) very diabolical, and B) Yahweh's gay lover. He's not remotely portrayed for comedy.
- Hades from Disney's Hercules is a variation on the trope, especially since he's portrayed as analogous to Satan. The Nostalgia Chick called him "Meg's bitchy gay boyfriend" in her review of the movie.
- The Nine Lives of Fritz the Cat had Fritz end up in hell. Upon encountering the devil, who seems like a cross between Big Gay Al and Vincent Price, he lets out, "Oh, Jesus Christ, Lucifer is a faggot!"
- Boris Lermontov in the 1948 film The Red Shoes is strongly implied to be Satan in human form. As with nearly the entire cast of the movie, he's also implied to be gay.
- Satan from Terror Toons gives this impression, referring to everyone as darling, among other things.
- Jareth the Goblin King from Labyrinth, played by David Bowie in all his fabulousness, was explicitly designed as a Glam Rock version of Satan.
- Nyarlathotep, the Satanic Archetype in H. P. Lovecraft's The Dream-Quest of Unknown Kadath, manifests to Randolph Carter as a beautiful androgynous "young Pharaoh" in a sparkly, rainbow-colored robe. In episode 53 of the H. P. Lovecraft Literary Podcast, the hosts described the "flamboyant" Nyarlathotep's throne room as similar to "a Dead or Alive concert."
- Johann Wolfgang von Goethe's interpretation of Faust includes an openly bisexual Mephistopheles, possibly the Trope Codifier.
- Inverted by Good Omens; while Crowley is described as being conscious of his appearance and makes some interesting remarks, it's Aziraphale, the angel, who comes off as "gayer than a tree full of monkeys on nitrous oxide".
- On a Halloween episode of Community, the study group tells scary stories which we see played out in Fantasy Sequences with members of the study group representing the characters. One story features Satan, who was represented by the Dean (who is pansexual, but extremely camp and prone to crossdressing).
- When K. Gordon Murray's Santa Claus (1959) turned up on Mystery Science Theater 3000, Crow characterized the demon Pitch this way. "I'm, like, poth-itively evil!"
- While not Camp Gay per se, on Reaper, Satan is a Depraved Bisexual. He actually used to be in love with God.
- Crowley, a Man of Wealth and Taste and the current King of Hell. He started out as a crossroads demon, the kind that humans make deals with, and these deals are made official with a kiss on the lips, so being a Depraved Bisexual is pretty much a job requirement.
- In the episode "Season 7, time for a wedding!", the main antagonist is the demon Guy, a sharp dresser with an affected lilt who is not shy about finding Sam and Dean attractive or about his own vanity.
Guy: I wasn't thrilled to see your new hubby was Sam freakin' Winchester. I mean, if he knew that I was here talking to you, he'd probably...
Becky: Gank your ass.
Guy: Yes. And I'm very protective of my ass. It's one of my best features.
- In the Warhammer 40,000 setting, the Chaos god of lust Slaanesh and its followers, whether daemon or human, are generally rather... flamboyant.
- Emperor Doviculus from Brütal Legend isn't exactly camp per se, but he has a s&m aesthetic (as does his entire faction) and a lot of Hard Gay/Depraved Bisexual overtones.
- Though actually the resident Satan Expy's servant, Demon Lord Ghirahim from The Legend of Zelda: Skyward Sword pushes Ambiguously Gay to the breaking point. The hair, the outfit, the Guyliner and white lipstick, the tongue-action, the uncomfortable body language, certain lines like "[that] filled my heart with rainbows", claiming that he and Link are tied by the Red String of Fate... Hoo boy...
- The Robot Devil in Futurama tortures Bender with musical theater when they first meet and is typified by his flamboyant mannerisms.
- On the short-lived animated series God, the Devil and Bob, the Devil, voiced as an Evil Brit by Alan Cumming, isn't extremely camp, but he's certainly dapper and way more uptight than God, who's voiced by James Garner and is more of a laidback Jerry Garcia type.
- Him in The Powerpuff Girls. One of the rare (mostly) serious versions.
- Played with by South Park, where Satan is gay, but is Straight Gay, if not full-on Manly Gay due to his huge and buff physique... at least most of the time, anyway. He spent all of "Hell on Earth 2006" acting like a spoiled teenage girl, but that was about it. He's also shown to be pretty nice, only torturing actual sinners while everyone else has A Hell of a Time (in South Park, everyone who isn't a Mormon gets sent to Hell whether they've sinned or not).