There are a lot of anime characters in My Hero Academia who are unable to control their powers, as Quirk usually manifests during his childhood. Most were taught to control their newfound abilities with love and care, which sadly was not the case for Arie.
When you reincarnate in another world, the last thing you expect is to be possessed by a fire demon. Sadly, that's what happened to Shizu when I came to the world of that time, when I reincarnated as a slime.
Naruto's world is full of incredible powers that would be hard for most people to control, as exemplified by Jugo. His clan has the ability to harness the natural energy and transform themselves into invincible fighting machines.
Mind reading is a power that many people would prefer to have, at least until they realize its concomitant dangers. Kotoura is unfortunately someone who learned this lesson in the most horrifying way.