Quirks in the My Hero Academia world can be trained and, in turn, get stronger and more powerful over time. These evolutions are gradual or sometimes very sudden, taking the user by surprise and whoever the individual happens to be fighting at that very moment. Everyone wants to be stronger but in as much as training needs to be done, some users are lucky that they do not need training to unlock different levels of their power but they do need training to maintain the new level and get familiar with it.