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Let's face it, some characters are pretty damn hot. Other characters may have raging hot passion. But in this trope's case, we find fictional creatures that are literally Hot-Blooded (or anything that's close enough to blood).
This type of being usually has an implication (or at least a possibility) of a temperature difference that's caused by metabolism-based weirdness. This makes some sense, as there are several organisms in Real Life that have an average body temperature that's higher than the human average.
Characters that can play with fire tend to exhibit this trope.
- Many fire-related monsters like dragons, salamanders, and fire-related familiars. Lava Beasts, fire elementals, and other creatures that actually made of some heat related substance are another trope altogether.
- Shishio, the season 1 big bad of Rurouni Kenshin. He was shot in the head and lit on fire before being left for dead. The fire left him disfigured, and all of his sweat glands were destroyed. As such, he has incredibly high body temperature, which (apparently) grants him almost superhuman speed and strength. The downside is that he can only fight for a few minutes before the heat buildup kills him.
- The Pillar Men from Jo Jos Bizarre Adventure have each mastered something that probably equates to a martial art in human terms. ACDC happens to use one that allows him to make his blood run at a temperature of 500 degrees celsius he then fights by poping out blood vessels and trying to spray and squirt his blood into his vitims. The results are just as horrifying as they should be.
- The Assblasters from Tremors The Series. As their name indicate, they fart fire to fly in a rocket-like manner.
- Werewolves in Twilight. (Perhaps that's why they so rarely wear shirts.)
- The Marat in the Codex Alera are slightly warmer than humans. This is important in the first book, when one is trying to sneak into a forest guarded by creatures who see in infrared.
- Sauron himself in The Lord of the Rings. The reason why his ring was glowing on his hand was because he was inhumanly hot.
- Invoked in The Sookie Stackhouse Mysteries (books that were the basis for True Blood); werewolves and other shifters are mentioned several times time as "running hotter" than their human counterparts.
- The "vampires" of I Am Legend are humans with a disease that (among other things) sends the body into overdrive. They run a fever of about 103 Fahrenheit as a baseline.
Alcide: We run hot.
- In Star Trek, the standard body temperature of a Vulcan is several degrees higher than that of a human, because they come from a desert planet.
- In Farscape, Scarrans are extremely hot, and can project this heat as a weapon. Compare with Sebacceans, who are colder than humans and vulnerable to hot temperatures. Scorpius, being a hybrid of both races, needs cooling rods implanted in his head to survive.
- Technically Scorpius can survive without coolant, but will always be weak.
- Dungeons and Dragons
- Remorhaz - hot enough that nonmagical metal weapons melt on contact and if it swallows you it's game over, instant death, no save, do not pass go, do not collect £200.
- Warhammer 40000 has the Avatar of Khaine, which has molten iron running through it's veins. It's also Wreathed in Flames.
- Many fire typed Pokémon are described as having a flame producing sac or other such organs in their bodies. Some Pokémon like Magcargo and Heatran literally have magma for blood.
- In PS238, Suzi has an internal body temperature which can melt lead, which appears to stem from her radioactive nature. Incidents where she loses her temper are explained as "gas leaks".
- Roza: The heroine's blood combusts when spilled.
- The whiptail lizard has an average body temperature at 106 Fahrenheit.
- The hotheaded naked ice borer, a cryptozoological animal invented for an April Fool's hoax.
- Canines in real life have normal body temperatures that are slightly higher than a human's, which may or may not have anything to do with werewolves usually having high body temperatures too.
- This is mostly true for most small warm-blooded animals. Mostly due to the Square-Cube Law.