Kung-Fu Dugongs are a type of dugong that live in Alabasta and are known for their martial arts skills and strength. As a result of being defeated and inspired by Luffy, the leader of the Kung-Fu Dugongs formed an entire crew of sea animals. The crew goes to the New World.
Seeing how the citizens tried to help Luffy, Fujitora smiled and admitted that he should not have blinded himself because he wanted to see what Luffy’s face looks like.
She is extremely grateful to him for everything he has done for her and was relieved when Luffy made it out of the country safely and hopes to see him again. As news of Luffy’s actions in Big Mom’s territory spread across the world, Rebecca was proud of his progress.
Shirahoshi trusts in Luffy’s abilities and shows deep concern for Luffy such as when Luffy lost a lot of blood from the wound he received from Hody and when Luffy went after Caribou for the stolen treasures. As the Straw Hats leave, Shirahoshi promises that the next time they meet, she will no longer be a crybaby.
The two also encountered each other at Water 7. Although they are now on opposite sides and will inevitably have to fight, Koby and Luffy still consider each other friends, since Luffy helped Koby muster up the courage to become a Marine.
When traveling with the Straw Hats, Vivi had a great amount of respect for Monkey D. Luffy, both as a captain and as her friend, openly showing both amazement and disbelief at his great strength and fighting abilities, which would sometimes make her doubt her own fighting skills and feel the need to show that she can handle herself.
Shnaks entrusted Luffy with his signature Straw Hat, which is of extreme sentimental value to Shanks (as it belonged to his former captain). There is an understanding between the two that Luffy will return the hat upon him becoming a great pirate, a promise that they have both taken very seriously
It is shown that Sabo has gained an overprotective attitude towards Luffy as he held off Admiral Fujitora and told him that should Luffy ever need help, he would be there for him, having refused to ever lose another loved one ever again.
Boa Hancock is the most beautiful woman alive. Hancock has fallen in love with Luffy, causing her to have “Love Sickness”, which was the cause of death of nearly all of the previous Empresses.
Two years ago, when a stray lightning bolt saved Luffy from being executed, Bartolomeo was in the crowd and was amazed by the spectacle. He followed all of the news about Luffy and the rest of his crew. He even traveled to Dressrosa for the sole reason to acquire the Mera Mera no Mi to give to Luffy as a present.