its hard to tell who luffy is scared of because he usually doesn't care about how much stronger than him someone is. though i would say he is scared of mihawk the most.
It's a no-brainer that Monkey D. Luffy is the most popular character of all time in One Piece. He is our adored main character, and right now he is enjoying the time of his life while getting OP. Luffy set off on his quest to become the next pirate king, and he is headed in the right direction.
While Luffy is fearless, carefree, and self-assured, there at times his confidence and pride were diminished. In fact, Luffy's one and only greatest insecurity lies with his inability of being able to protect the ones closest to him.
Perhaps the most shocking betrayal in One Piece comes during the Water 7 saga when the Cipher Pol revealed their true nature to the Straw Hat Pirates and the Galley-La Company. They posed as shipwrights and worked with Iceburg for quite a while, just to get their hands on the Ancient Weapon Pluton's blueprints.
The cook of the Straw Hat Pirates, Sanji is one of the kindest characters in the world of One Piece, and very humble as well. Having lived a terrible life growing up with the Vinsmoke Family, Sanji has a soft and kind heart.
Throughout his journey Luffy has made strong bonds with numerous women. At least two have fallen in love with him, Alvida and Hancock, whilst another two have become enamoured with him, Rebecca and Shirahoshi. Nami, Robin and Vivi all share close and deep bonds with Luffy and have become some of his closest friends.
Luffy is most likely to end up with Boa Hancock, as she has made it clear that she wishes to be with him and he has shown he cares about her a lot. However, Luffy has a strong friendship with Nami and has reacted to her physical appearance numerous times, so many fans still believe Luffy might end up with Nami.
Given the evidence, Luffy's IQ could easily be anywhere between 90 and 130. This would make his intelligence at least average and maybe a little above average, although not quite genius-level.
Luffy strongly dislikes the Blackbeard Pirates, especially their Admiral Blackbeard. He puts a lot of blame on Blackbeard for his role in Ace's death, having captured him and handed him over to the World Government and has fought against Blackbeard directly, whilst in Impel Down, due to what he did.
It's a no-brainer that Boa Hancock is the prettiest female character in One Piece. Also, One Piece has voted her as the most beautiful female in the anime.
