Emotion Eater / Anime & Manga

• Berserk: Feeding off of negative emotions is a Godhand trademark. Slan in particular enjoys feeding off the negative emotions that she can elicit from Guts.
• Bleach: Ichigo's Hollowification grows more powerful as he sinks deeper into despair. It's later revealed that it's like an overprotective brother. Hollow!Ichigo/the real Zangetsu only gets stronger when Ichigo despairs in order to completely annihilate that source of despair.
• Brave Series:
  • The Brave Fighter of Sun Fighbird:
    • Draias and his minions are shown to be fuelled by suffering and misery, so many of their schemes centre around making things as demoralizing as possible for humanity, such as destroying flower shows or – as shown in the America arc and the final arc, taking people hostage and subjecting them to backbreaking work to construct Devil's Towers.
    • Inversely, the final arc reveals that Fighbird and co. can be fuelled by positive emotions.
  • GaoGaiGar has the Zonders, which are shown to be fuelled by their hosts' stress, while GaoGaiGar FINAL reveals that mechas with G-Stones are fuelled by COURAGE.
• Coffin Princess Chaika: Arthur Gaz' ultimate plan upon resurrection is to plunge the continent into a new war, then use a network of magical satellites to feed off the resultant negative emotions and become all-powerful.
• Delicious in Dungeon:
  • The nightmares/shin trap their victims in never ending nightmares and feed on the fear they feel.
  • Later it's revealed that demons are abstract beings from another dimension of infinite energy that can grant any wish but will eventually devour the desires of those who are possessed by them. The more abstract and fantastical the desire, the more power they can gain at once, and they may sometimes even use illusions to grow a person's desire before feeding, like aging wine. However, eventually they'll devour all of someone's desires, including any of the desires tied to self-maintenance and preservation. At best, victims will be left without motivation to care for themselves until they eventually wither and die. At worst, they become catatonic living corpses, only technically alive because they're still breathing. When a demon feeds on enough desire... well, let's just say you really don't want to be around when it happens.
• The Devil is a Part-Timer!: In an oddly heroic variation, Maoh Satan can regain his full powers when large numbers of people are in danger by feeding off of their fear.
• Digimon: While they do not necessarily feed off them, Digimon can be greatly affected by their human Tamer's emotions, both positive and negative, resulting in different kinds of evolution.
  • Digimon Data Squad, Digimon Xros Wars: The Young Hunters Who Leapt Through Time, and Digimon Ghost Game take this further, with Digimon being able to feed on random people's emotions and pulling themselves into the real world by doing so. The emotions in question tend to be negative ones such as ambition, pride or greed, though. Savers even had the Seven Deadly Sins as the emotions that the the 'mons from the first several episodes had been homing in on. Only the partner Digimon seem to use positive emotions to get stronger.
  • Also in Ghost Game, Monster of the Week Asuramon's Evil Plan revolved around this. He was a Multiple Head Case with three heads representing "anger, mercy, and blessing", and wanted to experience the full range of emotions. To that end he began stealing humans' faces to feed on their emotions, leaving them as The Blank Empty Shells. It manages to do this to dozens of people across Tokyo and attempts to attack an entire stadium full of people until the heroes manage to talk it down after it steals Hiro's face and compassion.
• Franken Fran: Chapter 50 features Kanbe Sue, a 190-year-old woman whose brain has evolved to release trehalose, a dehydrating hormone, as a response to causing misery and suffering in others. Sue acted as the tyrannical matriarch over multiple generations of her family for over 100 years, before being ditched in a retirement home where she has attendants wait on her hand and foot. The ending of the chapter reveals there are others like her all over the world, causing suffering in exchange for eternal life.
• Getter Robo: Overcharged Shin Getter at the end of the Getter Robo Go manga is stated to draw power from its pilot's emotions.
• My Girlfriend Without Wasabi does this in a roundabout way. Kiyu, Aoyama, and Aka are all masks given life by Rino's latent demonic powers. Since demons draw their power from negative emotions, their life force is literally fueled by her feeling miserable and thus begin to fade away once she is happy with her relationship with Nozomu.
• Gonna Be the Twin-Tail!!: The Ultimaguil are a goofy, comedic version of this, but rather than emotions per se, they drain "zokusei" (a concept that has no direct equivalent in the West) — the pleasure a sentient being feels when doing something they like.
• Inukami! has Jesei who feeds on despair. He says nothing is more delicious than provoking despair. Naturally this means pushing people past the Despair Event Horizon.
• Karin: The vampires nourish themselves with emotions taken along with the victim's blood, temporarily draining their target of the emotion that they take. Most they exclusively drain negative emotions (such as despair, pride, or taking pleasure in lying), and leave their victim better off than prior to the bite (albeit a bit weak from blood loss). However, there do exist vampires that feed on positive traits. Elda's grandmother drains love from her victims and suffered greatly a few hundred years before the show started because of it. In the manga, at least, it's also noted that even negative-emotion draining isn't necessarily a good thing. Calera drains the ability to lie, which could be dangerous. Before the story started, Henry drained someone's pride, making her needy, according to her boyfriend. He broke up with her.
• Mega Man Star Force: The anime adaptation presents the planet-destroying weapon Andromeda as an entity powered by negative emotions. After its power source, the Andromeda Key, is damaged, the villains try to restore the weapon by inspiring negative emotions in humans to replenish it, but nothing seems to work. Eventually, the villains are ordered to abort the mission and, having at this point already decided Earth isn't so bad, decide to spend a few days sight-seeing before returning home...only to be betrayed and slain by one of their own gone rogue who had the real Andromeda Key the entire time, having given his comrades a fake. He uses their shock and despair to replenish the Andromeda Key and reactivate the weapon.
• Mnemosyne: The Big Bad likes the taste of suffering. He also has an army of monstrous angels and godlike powers at his command. Not a good mix.
• Naruto: This seems to be part of Hidan's reason for being a Jasshinist. The more pain he causes his victims before finally killing them, the more he seems to enjoy it. When he finally killed Asuma it was a narcotic high.
• Pokémon: To Be a Pokémon Master: When Brock is depressed over a girl (again), he's abducted by a Hatterene that torments him with illusions of girls dumping him over and over in order to feed on his negative emotions.
• Prétear: Near the end of the anime, Takako / Fenrir summons a huge tree that is powered by the feeling of despair, and makes sure she has a power source for it by using Mawata's feelings for Sasame, who already underwent an Evil Costume Switch, to drive the victim into the required state. This backfires in the last episode, when Sasame sacrifices himself to save Takako, which upsets her just enough to become the new victim of the tree.
• Puella Magi Madoka Magica has multiple examples. The monsters of the series, Witches, drive humans to suicidal despair to lure them into their barriers so that they can feed on their grief. When they're destroyed by magical girls, they leave behind a grief seed, which can be used to purify a girl's soul gem from the corruption of negative emotions that accrues over time and magic use. Magical girls have to be careful, because if they use the same grief seed too many times it can regenerate the witch it came from. To prevent this they give it to their magical companion Kyubey for disposal. It turns out that this system is deliberately engineered by Kyubey's species. It's intended to exploit the hopes of magical girls and the witches they're revealed to turn into in a process to generate the magic needed to stave off universal entropy.
• Slayers: All mazoku draw power from negative emotion. Cheerful and happy emotions cause them pain. To feed himself Xelloss riles up the main anti-heroes.
• Toriko: Neo can eat virtually anything, not only matter, but also energy, souls and even luck, but his favorite flavor is despair, which is bad news for his victims, since he prefers to terrify and torture them before eating in order to make them tastier. His ability to taste feelings is also his greatest weakness, since he absolutely can't stand the taste of anger, which ultimately leads to his defeat.
• Twin Princess of Wonder Planet has the Black Crystal, which feeds off of despair, unhappiness, misery, and anger. The more it feeds, the bigger and stronger it becomes, and as long as it can feed, it will continue to exist.
• The World God Only Knows: The runaway spirits hide in girls to feed off of their negative emotions. The Goddesses feed on love instead to get stronger.
• YuYu Hakusho: One of the demons near the beginning.

---