InuYasha Miroku has the Wind Tunnel , a black hole-like void in his hand that pulls in everything in front of him unless he has it covered up using his prayer beads. What's worse, eventually the void will be big enough to pull in him and anything that happens to be around him unless Naraku is destroyed. It's one of the reasons he keeps asking random women to have his children, so that he'll have a descendant to continue the fight if he fails. The other is that he's a Handsome Lech.
Inu-Yasha also has a genetic predisposition to this problem, which his father made a magic sword to fix. After it breaks the first time, the chances of him getting extra power in a way that makes him kind of evil increase dramatically, especially if he doesn't have the sword on him.
A-Ko from Project A-ko wears bracelets to keep her Super Strength from crushing everything she touches which tends to happen anyway as she's kind of spazzy. Also, every morning her Late for School Super Speed run causes damaging sonic booms, yet the damage is always repaired by the next morning.
A-ko does not wear her wrist bands to bed, and in at least one movie was able to throw a pillow to silence an alarm clock without destroying anything. Maybe her powers don't work unless she's fully awake? Likewise, Rumiko Takahashi 's Maris the Chojo wears "strength restraints" since she's a Thanatosian — she has six times the normal strength of a human being. Even with the restraints she still ends up accidentally destroying much of what she touches. Takahashi also used this with Asuka Mizunokuji in Urusei Yatsura.
Not only she has massive Super Strength , but she's a very shy Shrinking Violet with a powerful phobia of almost all men — this leads her to accidentally harm people even with hugs , i. Kyo from Fruits Basket has to keep his prayer beads on whenever he's in human form to prevent him from instantly reverting to his demon form. Also a major problem for Saki Hanajima. When she was younger, she couldn't block out people's feelings, causing her to become quiet and withdrawn.
Because of her refusal to interact with people, she starts getting bullied , until she finally snaps , suddenly discovering her Psychic Powers and using them to put one of the bullies in the hospital. Naruto Kakashi was offered a special eye from his dying friend, but can't turn its power off, so he covers it with his headband in order not to waste energy.
If Naruto reaches four-tails or above, then he needs an outside source or the Fourth Hokage to calm him down, because he can't on his own, and if given enough incentive or time, more tails will come out.
This is actually a very real concern for most jinchuuriki. If too much of the beast's will escapes with the chakra, they'll be overwhelmed and the beast will break out of the seal. Note, these all change over time. Jinchuriki can learn to tame and control the entirety of their Beast's power. Naruto, for example tamed Kurama, the Kyubi, and can use all of the Fox's power and can overwhelm five Biju at the same time.
In Darker Than Black , the superpowered "Contractors" must pay for using their powers by performing a pointless action specific to that individual shortly afterwards.
Those who don't have to make such a payment are called "Moratoria", suffering from Power Incontinence. Moratoria are stated to be extremely rare, the only one shown in the series having been changed from a normal Contractor as a side effect of a contract-suppressing plant.
The same person reverted back into a normal Contractor in the end, something stated to have a near-zero likelihood, but not before going on several uncontrolled rampages wherein she incinerated several people.
Sometimes the pointless action makes their powers very much not worth it, like having to drink the blood of children. Or being forced to smoke. Mao has a Geass that allows him to read the mind of anyone within meters. Over time, he loses the ability to control it and as a result hears the surface thoughts of everyone within range. Late in the first season, the same fate befalls Lelouch's Compelling Voice Geass; he suffers a brief, debilitating headache, and doesn't realise that he's lost control over his power.
He later makes a joke to Euphemia about killing all Japanese people, and realises a moment too late that he's Geassed her into doing it. In the beginning of R2, C. And speaking of C. In general, anyone who receives a Geass power will eventually lose control of it. Minki the Oni has incredibly destructive powers, which she loses control of and end up backfiring when she's not wearing It's played way more seriously when in a fixed day, Nube loses a good part of his control over his Devil Hand where a powerful demon is fixed.
Said demon is Bakki, Minki's older brother. This means his whole arm and then half his body begin mutating. If not for Tamamo, Kyouko, and Hiroshi taking a trip to Nube's past to find out how to reverse the process, Nube's whole self would've been completely consumed by Bakki. Aki Izayoi, from Yu-Gi-Oh! To make things worse, her Evil Mentor Divine was purposely training her so that her Psychic Powers would be more destructive, as part of his plans to form an army of psychic assassins.
But it wasn't automatic. Amuri's Reflect, causes her to repel physical objects that she touches suddenly, Suzu's Escape causes her to be moving continuously, and Perriere's Infiltrate causes her to pass through most solid objects. This leads to Hao's Start of Darkness and causing further Power Incontinence for Anna in the form of her spontaneously summoning demons.
Negi Springfield's Sneezes of Doom are accidental discharges of magic caused by ordinary sneezes. His Black Magic ability is also acting up; it's slowly turning him into a demon and causing poisoning-like symptoms in the process, and as the poison and transformation progress, he increasingly goes into Super Mode involuntarily.
The World Tree leaks magical energy all over Mahora's campus for a few days every year. Every 20 years or so, it becomes incredibly powerful, which can lead to some serious problems. Such as a request for a kiss turning Negi into a Determinator or The Big Bad using the energy to power her magic robot army. In Busou Renkin , the character Victor is constantly displaying a life-draining ability that he can't turn off, even if he wanted to Justified in that it is a vital life function; Victor compares it to breathing.
The Mightiest Disciple has a variant with Apachai, as his past of fighting in a lot of life-and-death matches not by his own choice has left him psychologically incapable of holding back when he fights. As such, he undergoes special training so that he won't accidentally kill Kenichi during training. Several people in A Certain Magical Index.
Touma can't turn his right arm off, so he constantly cancels his own luck and interferes with any magic in the vicinity. Aisa Himegame constantly draws in vampires and kills them en masse. Accelerator suspects that he has such an abnormal appearance because his power deflects sunlight off him, but isn't really sure.
Index has no control over her John's Pen mode. Aureolus Izzard needs intense focus to control his alchemist abilities and appears to rely on some type of acupuncture for it, and it still turns on him. As the final major example, the angel that gets sucked down from Heaven really can't help the fact that it has to return and that in doing so it will cause a major catastrophe. It doesn't seem very thrilled about the idea.
AKIRA Tetsuo starts losing control of his powers following the battle with Kaneda, which manifests as his body starting to mutate around the metal arm he built with them after losing the original to SOL. Eventually, his body starts mutating out of control , leading to the most horrific scene of the movie.
In the movie, Akira himself seems to have this, as he has reached such a power level that when resurrected, his powers automatically destroy the city of Neo-Tokyo, and then he disappears into a dimension of his own creation, sucking down everything within a few miles' radius with him. He caused the first two by needing to run a Gambit Roulette to get rid of his ability to predict the future he couldn't turn it off , and he caused the latter two by accidentally turning someone into a zombie simply because while she was dying he wished for her to open her eyes again.
The entire multiverse gets fucked up and screwed over several times in trying to fix that boo-boo. Joshua Christopher from Chrono Crusade has the power to read minds after he's given the horns of a powerful demon.
However, he can't control the power, so it quickly drives him insane. Ageha, Frederica, and Shao from Psyren all have this as a result of their PSI powers being fueled by emotion instead of focus of thought. However, his ability to hear voices gradually disappears as people die around him, it can't seem to be controlled, and it takes a toll on him during said war.
However, after the Time Skip , he has mastered it to the point it borders on Telepathy. Luffy had the same problem when he developed the Colors of the Supreme King Haki. He ended up knocking out everyone in the general vicinity whenever he lost his temper.
After the Time Skip , he has full control over it. Oda notes it to be typical for most Devil Fruits that the users have trouble controlling their powers after first eating their fruits. Giraffe having trouble controlling which form he transforms into, Blackbeard stealing Whitebeard's Gura Gura Fruit powers and accidentally sending a tsunami at Sabaody Archipelago, and Sabo eating the Flame-Flame Fruit , as he has trouble turning the power off.
The eponymous creations in Neon Genesis Evangelion might count. True, Evas are Empathic Weapons of the Humongous Mecha variant, but still, if they go berserk , the only thing you can do is run away until they run out of power. If, however, the Eva in question is Unit 01 , chances are it may not stop even without power , so just keep running. When his power limiter breaks or is taken off and he reverts to his true form, he will try to kill anything that moves, including his friends.
He'll probably be reasonably successful, as he's immensely powerful in this form. When it breaks, the limiter can only be recreated by the gods or Sanzo. Hakkai also has to wear his power limiters, although the risk of him losing himself and going berserk when he removes them is only because of the minus wave, and when he has been shown to remove them, he remains in sane ish mind and can put them back on to revert to human form.
But he's currently at risk when taking them off, probably. Translucent is a gentle Slice of Life manga about a girl who's slowly turning invisible. This is presented as a documented medical syndrome, not a special power; at least one adult she knows is permanently invisible. The girl appears more solid when she's feeling self-confident, but will eventually have to learn to find a happy life and accept her condition. Sket Dance introduces Koma-chan, a ladylike and desperately shy Huge Schoolgirl who is not able to control her enormous strength whenever she's embarrassed.
Bleach Coyote Starrk is so powerful that his reiatsu inadvertently killed anything that came near him, leaving him incapable of socialising or forming any emotional ties to others.
He was so desperately lonely that he joined Aizen's cause solely because Aizen was the first person he'd ever met who could withstand his reiatsu without dying. Initially, Ichigo has no idea how to control his enormous reiatsu, and when his reiatsu explodes out of him when fighting his very first Menos Grande, he would have died if Uryuu hadn't taken control of his reiatsu for him and calmed it down.
Although he gets better at it, he does not have finesse of control and his power output is so great even when in a calm state that he's incapable of sealing his zanpakutou, causing it to exist in a constantly released shikai state by default. His enormous leaking reiatsu also affected several of his classmates, allowing them to become spiritually aware.
He possesses a Substitute Shinigami badge that, among other things, acts as a damage limitation device for his reiatsu. Kenpachi cannot properly control his reiatsu output.