Over the years, Zoro has proven himself as the most reliable friend Luffy could have. If you ask this question to luffy, you'll find the answer will be the same when he asked by many pirate to become theirs leader. (After dressrosa arc).
Zoro is perceived as the vice captain of the Straw Hats. He is arguably Luffy's most loyal crewmate. He has displayed the most respect and dedication to Luffy by following his orders, proclaiming promises, and being the most vocal about Luffy achieving his dream of becoming the Pirate King.
Nami is arguably the closest friend to Luffy out of all the women. Nami has met the majority of Luffy's harem, since she has known him the longest, and is on very good terms with Robin, Shirahoshi and Vivi.
Zoro's "best friend” (親友) in the last panel probably refers to Kuina, not Luffy considering he has used the word 親友 only for Kuina in his life. BTW, Smoker described Zoro as Luffy's partner (相棒) and Roger called Rayleigh his "partner" as well. It makes sense why Zoro wouldn't call Luffy his best friend.
Welp, he did say "my captain and my best friend." I dont know about other readers, but i for sure know that Zolo's best friend is (was) Kuina.
Zoro x Hiyori
The Wanokuni arc of One Piece gave Zoro the spotlight he deserved but fans were more gravitated toward his scenes with Hiyori. It wouldn't surprise fans if Hiyori reveals her feelings for Zoro, her savior. They shared intimate moments and Zoro might even find a sense of belongingness when he's with her.
Canon. Usopp and Nami are very close friends, and crew mates, who are members of the Straw Hat Pirates.
Sir Crocodile was the main antagonist of the Alabasta arc of the series and the first Shichibukai that Luffy took down. Crocodile is easily one of the most difficult fights that Luffy has ever fought as he lost to him twice. In fact, Luffy would've died both the times had luck not been on his side.
Zoro's loyalty to Luffy is incomparable among the crew and develops through the series. Even though he joined Luffy's crew, his main goal was to become the strongest swordsman.
Dracule Mihawk is Zoro's biggest rival, being the man who holds the title of the World's Strongest Swordsman. Mihawk is extremely skilled with the blade and his swordplay is described as very aesthetic. He is also extremely good at using Haki given that he taught its usage to Zoro.
starting with the first kiss shown in one piece it happened during the story of thriller bark where luffy and the straw hats go to thriller bark to defeat moria. and retrieve the shadows that were taken by it during episode 365 absalon takes nami hostage.
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.
[One Piece] Luffy Gets Married with Hancock_2.
1 Shirahoshi
Her ability is known to be great enough to destroy the entire world and Luffy is her guide. Her existence alone can bring the entire world to heel and now that she has gained full control over her ability, it goes without saying that she is quite likely the greatest ally that Luffy has so far.
Nami and Sanji, the pairing the manga itself harps on most, as well as the one most fans talk about. Some are against it due to how big of a perv Sanji is and how he loves every woman he sees.
Out of all the Straw Hats, Usopp is easily the least loyal. Not only did he nearly abandon the heroes amidst their darkest hour at Dressrosa, but he also fought Luffy directly for the rights to the Going Merry. It is implied that Usopp thinks he has become more dependable over the years.
Marriage Ceremonies
In Absalom and Nami's ceremony, Nami was unconscious and a zombie recited the vows for her before forcing her to kiss Absalom, putting their possible marriage into question should the ceremony have been completed.
Charlotte Pudding is a supporting character from the anime and manga series, One Piece. She is Charlotte Linlin's 76th child and 35th daughter, and one of Charlotte Linlin's favorite daughters. She was arranged by her mother and Vinsmoke Judge to marry the Straw Hat's cook and Judge's estranged son, Vinsmoke Sanji.
Hiyori and Zoro proceeded to talk about the current status of the alliance including the whereabouts of each of the Nine Red Scabbards. After their conversation, Hiyori wondered if she should meet her brother. Hiyori and Toko then slept with Zoro and later woke up to meet Brook.
Usopp remains to be the weakest member of the Straw Hat Pirates. In Wano, the vast majority of the members of the Straw Hat crew received good power-ups. However, Usopp was one of the members who did not receive any power-up and thus is lagging behind.
8 Ace: Stronger
Being the strongest brother, Ace had quite a responsibility on his shoulders to protect his two brothers and he did just that. Ace was able to save Luffy countless times, thanks to his strength, and one of his reasons to keep growing stronger was so he could protect Luffy.
Weaknesses. Despite these advantages Luffy is not immortal. Though immune to lightning, he can be damaged by other elements such as fire or ice, attacks involving cutting or stabbing and Haki-infused attacks.
Robin also seems to be very devoted to Luffy, as he is the only person whom she wants to get stronger for. This shows how great her dedication to her captain has become after the Enies Lobby Arc. Upon learning of Ace's death, Robin was very shocked and became greatly concerned about Luffy's wellbeing.
Ever since the Enies Lobby Arc, fans have sensed subtle romantic tension between Franky and Nico Robin. Though this isn't explored explicitly across the series, the two do have a consistent dynamic, as dark and serious girl and bright and silly boy.