Board Thread:Questions and Answers/@comment-32757117-20170803014555

In the anime, it is said that you begin to show signs of a quirk around the age of 4. How does it work for people like Yokoyami (the bird guy) or Ashido (the alien girl)? Do they just suddenly grow a bird head or turn into an alien-like creature? If this was explained in the manga, then I wouldn't know because I don't read the manga. Anyone have an explanation?  