why does luffy have a scar under his eye

Another reason could be related to his personal growth. He might be trying to master the power of the eye in private. Naruto has always been one to face challenges alone at first. By hiding his eye, he can focus on understanding and using its power without distractions or the pressure of others' expectations.

In some fanfictions, Naruto might get the scar on his eye during a particularly intense battle with a powerful enemy. Maybe it was a close encounter with a rogue ninja's weapon that managed to leave a mark on his eye area.

Maybe Ash doesn't want Serena to worry about him. He might think that the battle scar is a sign of his vulnerability and he wants to always appear strong in front of Serena.

I think it's because he enjoys confusing and tormenting others. Each different story is like a new layer of madness he presents. It's part of his way of playing with the fear and confusion he creates around him.

His scar might make some people more intimidated by him. They could see it as a sign of his dangerous experiences and be a bit afraid to get too close. For example, new acquaintances in the fanfic might be hesitant to approach him at first.

"Conan: I Am Not Doing My Own Business" was a suspense-mystery detective novel written by the author after a break. The male lead, Chen Baicheng, was a bald agent with a scar on his right eye. This novel is humorous and full of exciting agent missions. I believe you will laugh your head off. I hope you like this fairy's recommendation. Muah ~😗

In the 2019 The Lion King, Scar does not have mange. The film might focus more on other aspects of his character and storyline rather than introducing this particular trait.

No, as of the current manga chapters, Luffy doesn't have a kid.

Yes, Thor does lose his eye in the comics. It's a significant event in his storyline.

Yes, Thor does lose his eye in the comic. It's a significant plot point.