Even the coolest superpowers in the world have a downside if the user can't control them. In fact, many anime characters who can't control their power would rather be weaker than they actually are, because then at least they wouldn't be a danger to themselves and others. For many of these characters, gaining control over their abilities is the most important thing in their lives.
Who are some of the best anime characters with uncontrollable powers? One particularly interesting one is Shizu from That Time I Got Reincarnated as a Slime. Shizu's body hosts Ifrit, a fire demon who occasionally takes over her body and forces her to commit atrocities. As she grows older, she loses more and more control. There's also Izuku Midoriya from My Hero Academia, whose incredible energy storing power One For All destroys his body every time he tries to use it - at least, that is, until he masters his abilities.
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Izuku Midoriya begins My Hero Academia with no powers to speak of unless being adorable counts. This makes him unusual in a world where 80% of the population has a power, also known as a quirk, and it puts a serious damper on his dreams of being a hero. When his superhero idol All Might decides to make him the heir to One For All, Izuku realizes that being a hero may be within his reach after all - that is, if he can learn to control his abilities.
For Izuku not to be instantly crushed by One For All, he must be in peak physical condition. Even then, it takes a ton of practice before using his quirk doesn't turn his bones into pulp. While those injuries are quickly mended thanks to Recovery Girl, a school nurse with healing powers, he still has to endure severe pain every time he tries to use his abilities. Though his control increases with training, his powers are evolving at the same time - and what they turn into may be beyond his ability to manage.
Every character who has a tailed beast implanted in their body struggles to control its power to some degree, but Gaara's case is one of the most dramatic. Gaara was forced to become the carrier for the One-Tails, a raccoon-like beast with monstrous sand-based abilities, while he was in utero. As a result, he was born prematurely, and his mother passed away after giving birth to him. He grew up almost totally unable to control the One-Tails, who would routinely terrorize the town. In fact, one of the only effective countermeasures was to stop sleeping - if he fell asleep, it would go on a rampage.
Because Gaara was so dangerous to be around, his father ended up sending assassins after him. Gaara became so miserable that he started to take pleasure in the carnage. While he had gained greater control over the One-Tails, he used it to do more damage, not less. It was only after meeting Naruto that he began to value human life, and began to use the One-Tails power in a positive way. He still can't go to sleep, though.
Akihito is half-human, half-youmu. Youmu are demonic creatures who are typically hostile and cause a ton of damage to the human world. There's a whole industry dedicated to stopping them - including Akihito, whose priorities lay in protecting humanity. Though he doesn't actually want to hurt anyone, he sometimes loses control of his youmu side. For this reason, many Spirit World Warriors believe he should be disposed of, but the powerful Nase family protect him on the grounds that he can help them learn more about human/youmu hybrids - but they're ready to take him out if he ever completely loses control of his youmu side.
When she's first introduced, Juvia Lockser appears to have little control over her water powers. Rather than being able to turn them on at will, they're constantly active. As a result, she spent most of her life under constant rainfall. Because her powers are influenced by her emotions, she is eventually able to rein them in after meeting Team Natsu and experiencing true happiness for the first time. Once she's happy, the rain stops, and she finally experiences sunlight.