Hermione might be the one. With her extensive research skills and vast knowledge of magic, she could have stumbled upon a way to remove the scar. She was always determined to help Harry, and this would be just another of her great contributions.
Well, Bolsa could get many of his stories from various sources. It might be from old books, or from listening to others' tales. Sometimes, inspiration just strikes from everyday life situations too.
Luffy shows his love for Nami in a very unique way. He gives her a great deal of freedom on the ship. He allows her to manage the money, which is a big sign of trust. Also, his constant protection of her is another way. For instance, during battles, he makes sure Nami is safe. He doesn't question her navigation skills and always follows her lead in that regard. His simple gestures like sharing his food with Nami also show that he cares about her in his own Luffy - like way.
A hairy chest can sometimes be an indication of good health. Testosterone levels are related to hair growth, and normal testosterone levels are important for overall male health. It could also mean that his endocrine system is functioning well.
Luffy is still alive and kicking in the manga. The story keeps evolving with him at the center of the action, encountering new enemies and growing stronger.