Power Incontinence in Visual Novels.
- An interesting example in Area X as Livan doesn't lose control of his own powers, as he is a Muggle, but when he used the Silver Orb, which contained a huge amount of Mana, as well as Elcia's powers, to try and resurrect everybody who died in the avalanche, he loses control of the Silver Orb's power, and split the timeline into several different timelines, scattering everybody he resurrected among them.
- Two important examples in Da Capo, though only one really minds. Sakura's magic is highly dependent on her emotions and acts out in ways she wouldn't normally. As a child, her magic would accidentally break people's arms. In the main story, a girl gets a branch dropped on her head in Sakura's route and there are implications that she is accidentally responsible for Nemu's sickness in that route. Kotori is the other example, who often feels fatigued and ill due to constantly reading the minds of others, especially their more negative thoughts or ones in which she is the school idol, not a person.
- Ran in Destiny Ninja 2 has trouble controlling his ice skill. As a child, he almost killed Fuyukiku with it, and he accidentally hurts the heroine during his route.
- In Fate/stay night, Rider wears an eye visor constantly, not just to hide that she's Medusa, but also the fact that her petrification ability from her eye cannot be restrained. Or if she's in her normal mode, she wears a pair of glasses. The exact same style of glasses as Shiki's actually — they're called Magangoroshi (Mystic Eye Killer) glasses. Seeing as Aozaki Touko is one of the few connections between the Tsukihime and Fate timelines, as she's the one who makes Shirou his artificial body, it's very likely she also made Rider's glasses, as she made Shiki's as well.
- Anghel Higure from Hatoful Boyfriend has the power to cause everyone around him to hallucinate that they're in a fantasy world of his creation. This can be amazingly useful, especially in cases of brainwashing, which the hallucinations override. However, Anghel himself has no innate immunity to this and cannot turn it off. It's debatable if Anghel's actually aware that he's tripping, especially since he's writing a manga about his fantasy world, but he's convinced that he's a fallen angel.
- Phoenix Wright: Ace Attorney:
- Maya Fey suffers an inversion of this trope at the end of the first game, where she finds herself unable to use her channeling abilities due to a lack of practice.
- In Dual Destinies, this happens to Athena Cykes, who possesses an extremely acute sense of hearing that allows her to read emotions, but has no control over this power. The headphones she wears are her Power Limiter.
- In (P)lanets - the life of normalcy has ended!, the purpose of the academy is to teach psychic students how to control their powers.
- Marin has a harder time controlling her psych than other students because she wasn't born with it. As a telepath, she had to learn to turn it off so she wouldn't hear everyone's thoughts all of the time.
- Ryuu's teleportation has control issues and he runs out of energy quickly due to a heart condition.
- Kaius doesn't use his powers Pure Energy because it is too dangerous and before he knew how to control them he accidentally killed his mother.
- In addition to his telekinesis, Lucan also has telepathy which allowed him to unconsciously brainwash all of the girls in the school into loving him. He doesn't like the result.
- In Riddle Joker, the superpowered Astrals can experience "control loss," in which their power rapidly increases in strength and fires off radomly wile the Astral loses higher brain functions. This is not a natural process but induced by a drug developed by an anti-Astral spy agency.
- In the Bad End of Spirit Hunter: NG, the gruesome murders of Akira's companions cause his Bloodmetry to go out of control, causing him to frequently read his own blood and be fed the vivid memories of their deaths.
- Syrup and the Ultimate Sweet: During Syrup and Butterscotch's journey to Mount Sorbet, Butterscotch gradually begins to gradually lose control of her magic powers. First, she tries to blast an attacking wolf, but accidentally turns it pink instead. Second, her warmth spell wears off, forcing her to borrow Syrup's coat. Third, after she creates an ice wall to stop the wolves from chasing them, she finds herself unable to remove the wall once the wolves are gone. This is caused by a combination of stress, overestimating her own abilities, and the fact that she's already been exhausting her magic to make herself look thinner.
- Tantei Opera Milky Holmes: Ellery's power activates without her control, and her power is to activate other people's powers.
- Tsukihime:
- Shiki sees lines of death on everything, allowing him to destroy nearly anything with even a butter knife. Shortly after acquiring this effect, he started having nightmares of the world falling apart at its seams and would have gone insane if he had not been given indestructible glasses that block this effect. Using this power anyway puts a strain on his brain and usually gives him headaches when he takes off the glasses. In the manga, he also kills things with a tree branch and his finger nails.
- On a lighter note, Seo Akira can see the future... sometimes. With the amazing control to know that Shiki will decide on impulse to invite her to chat after lunch. On a plus note, seeing the future doesn't lock it in place for her like most forms of clairvoyance, which also means that the above chat after lunch doesn't necessarily ever happen.
