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Anime And Manga
- Dragon Slayers in Fairy Tail each have their own signature element, which they use to attack. They can also replenish their energy by eating that same element. Elements, of course, don't usually count as abstract concepts... except the specific case of darkness, which is really only absence of light.
- In Majin Tantei Nougami Neuro, the plot is kicked off when the demon Neuro comes to Earth to feed off the complexity generated by riddles, puzzles, and mysteries. To do so, he starts solving murders and feeding off the culprits. One of the later story arcs has Sicks offer him a mansion full of fabricated crimes for his consumption, and Neuro is appalled by the artificial riddles.
- The grammasites, from Thursday Next. Parasites that live in books, examples include adjectivores, spelling vyruses, and the like.
- From the Eighth Doctor Adventures, the Fendahl Predator devours concepts — as a group of beings who believed You Cannot Kill An Idea discover to their cost.
- And let's not forget about the Babelfish from The Hitchhiker's Guide to the Galaxy. That little creature feeds on the thought processes around its host and excretes a neuronal matrix into the host's brain. Incidentally, this enables the host to instantly understand any form of communication whatsoever. It is said that the poor Babelfish has wreaked more havoc on sentient life in the universe than all armies that ever marched combined, due to obliterating all boundaries to understand one another.
- Diane Duane's Star Trek novels have the Iruhe, who eat the minds of sentient beings, leaving only breathing but mindless bodies. They appear briefly in The Romulan Way, where they devour the minds of two ships' worth of Romulans (who have just left Vulcan and were in the process of looking for a new homeworld, and were lured in by the Iruhe's illusions of a water-rich, habitable planet); the rest of the fleet barely escape. The Iruhe are also the villains of her TNG book Intellivore, where they have gained the ability to move their planet about to prey on planets rather than just starships.
- The eponymous darkangel in The Darkangel Trilogy must feed on the souls of human maidens in order to complete his transformation into a vampyre — leaving them mindless, emotionless "wraiths" who slowly wither away physically as well.
- In The Nekropolis Archives, Waldemar is an ancient vampire who subsists on memories rather than blood. He runs the Great Library of the Nekropolis, selling information in exchange for eating one day's worth of memory from the person seeking it.
Live Action TV
- Red Dwarf has the emohawk, a domesticated breed of the Emotion Eater ploymorph that instead feeds on personality traits, during its episode it enjoys a meal of Rimmer's bitterness and Cat's cool. While this left the Cat in his bumbling and useless Duane Dibbley persona, it radically helped Rimmer, who became his heroic parallel universe persona Ace Rimmer. What a guy!
- Buffy the Vampire Slayer season five Big Bad Glory had to manage her hell god composure by eating human sanity, leaving her victims gibbering wrecks.
- Doctor Who has a few examples;
- The Weeping Angels send people back in time so they can feed on the lives they never lived. To resurrect an entire cave system of dying angels, one crashes a starship into it that happens to harbour one of Series Five's cracks in time; the Angels have a feast on all the lives the crack had stolen from existence, until the crack starts swallowing them.
- In "Amy's Choice", the psychic pollen that places the Doctor, Amy and Rory in a shared dream state fed off the darkness in its victim's minds, creating the image of the Dream Lord as a manifestation of the Doctor's own self-hatred.
Amy: But why didn't it feed on us, too?
The Doctor: The darkness in you pair, it would have starved to death in an instant. I choose my friends with great care. Otherwise I'm stuck here with my own company and you know how that works now.
- The minotaur from "The God Complex" eats faith and lives in a maze designed to show its inhabitants fears that will cause them to call onto their faiths, "cooking" them.
- The planet-sized creature known as the Old God from the episode "The Rings of Akhaten" fed on stories. The people living in his system used items of sentimental value as currency so they could be given as offerings to it and taught their Queen of Years all the stories of their culture so that if it ever awoke he could feast on her rather than their entire system. They even believe that the Old God made the first life in the universe, possibly to create tasty stories for it to feast on.
- The Trickster (from Doctor Who spin-off The Sarah Jane Adventures) and his minions, the Trickster's Brigade, feed on the chaos created when an established timeline is altered in some way.
- The Teller in the episode "Time Heist" eats guilt, and will turn your brain to soup to get to the buried stuff.
- The episode "Flatline" features bizarre creatures which eat dimensions; shrinking items or turning them into images for sustenance.
- The Wraith in Stargate Atlantis consume human life forces via organs in the palms of their hands.
Myths & Folklore
- The baku in Japanese folklore eat dreams.
- Dungeons & Dragons
- Several monsters eat the psionic energy of psionic creatures, such as Brain Moles, Cerebral Parasites and Intellect Devourers.
- The undead known as a shadow drains the strength of other creatures.
- The Forgotten Realms setting has Dendar the Night Serpent, an Eldritch Abomination who feeds on the nightmares of mortals and deities alike. Among the duties of the Chultan god Ubtao is guarding the Realms against Dendar's emergence from beneath the Peaks of Flame. If Dendar defeats Ubtao, legend has it her next meal will be the universe itself.
- The Word-Eater of Clan Malkavian in Vampire: The Masquerade is well-known for this sort of thing: having transcended his need for blood, he's instead taken to devouring words and the ideas associated with them; more frighteningly, the words and ideas he consumes cease to exist and cease to ever have existed - hence the reason why nobody can remember the Word-Eater's true name or any of his victims. Even the Clanbooks aren't safe from his appetites, the original Malkavian clanbook depicting him in the act of eating the words right off the page, and looking decidedly interested in the reader...
- Drowzee is a Pokemon that is famous for eating dreams, but its hardly the only one, as other psychic and ghost Pokemon are capable of learning the move "Dream Eater" which does damage and heals the user, but only if the target is asleep.
- Other Pokemon are said to consume emotions.
- Keine Kamishirasawa from Touhou is a were-hakutaku, whose ability is to eat history in human form, and create history in hakutaku form. It is unexplained how she eats history, but the effect seems to conceal the thing whose history is being eaten, without actually removing its existence.
- The tutorial of Heroes of the Storm has fun with this idea.
Diablo: How tastes your fear, mortal!Raynor: I wouldn't know, I'm not sure you can actually taste fear.
- Grrl Power: Vehemence is "an innate user of vehemic energy ... sometimes called vistric energy." The layman's version:he gains power from violence. He makes his debut by sticking around an all out super brawl between a super hero team and a team-up of villains. Only when it's over does he enter the fray himself, now strong enough to go toe-to-toe with one of the most powerful super beings in the world and only making himself stronger for it.
- In Dan and Mab's Furry Adventures , the resident Succubi and Incubi passively feed on the emotions of surrounding creatures. They are able to eat souls, though probably most of them don't, since that would get them in trouble rather quickly. Also, the various clans each have one emotion they especially like, which include Pride, Pain, Anger, Lust and Joy. Because of their abilities, they are vulnerable to mental manipulation. For instance, you can remember being tickled "at" them, and they will react as if it were actually happening. They also don't need to sleep or eat when receiving enough emotional energy. However, they do enjoy coffee, ice cream and other 'treats' just like every other living creature, and they can sleep if they want to, although they do not dream. Emotional consumption apparently replaces the effects of REM sleep.
- Adventure Time has a few examples; a character who eats drawings from within the paper they reside, and Marcelline, a vampire who eats not blood, but the colour red.