For a long time I follow this manga called Boku no hero academia or my hero academy, this character Mirio Togata is one of the most interesting in my opinion, the simple fact of training his Quirk to the point that he can control every particle of his body .
Your Quirk is called Permeability, which allows everything to pass through your body, it can be a disadvantage because everything happens absolutely through you, oxygen, light, vibrations.
Having to overcome the fact that while activating your Quirk you can not see, hear or breathe and have the feeling that it is falling, it must be frightening.
This character with the protagonist Izuku Midoriya are characters that show the clear example of personal improvement.
I made this drawing a while ago and I liked it a lot as it is.