Can mangaka change their avatar? Like what happened if they don't like their avatar anymore and they what to change? I did try my best if they did but i can't find anyone who did the closes did i found is their art syle nothing about their avatar

I am looking for a manga where the main character finds a book, and he’s able to use that book to receive talents from previous famous people. He even learns to use needles as a form of medicine as a talent to cure people.