Well here i have a list of possible members and I will present them and the reasons for them to join:
JIMBEI: The first son of the sea Jimbei is the one the one from this list that is more probable to join because Luffy invited him to join back at Fishmen Island. Jimbe said he would like to join but had to resolve things with Big Mom first. I believe that if Jimbei gets out of Whole Cake island alive he will join the Straw Hats for sure. Some other reasons for him to join are: He is as strong as base form new world Luffy, He would be the represntant of the Fishmen in Luffy’s crew, everyone in the crew like him, he helped Luffy at impel Down and Marineford, he was Ace’s friend, Jimbei is a nice guy with a well developed backstory, he is helping them at Whole Cake.
Ceasar Clown: Ceasar I like Ceasar a lot but he is a jerk who betrayed Big Mom for women money and parties. He druged kids, Luffy, Nami, Sanji and Chopper hate him and he is together with Doflamingo. With all of that in consideration though he has many favourable Mugi no Traits. They are: He has dream wich is to be greater than Vegapunk, he is extremely funny, he is an ex-villan, he is a LOGIA, he is considerably strong, he is stuck with the Straw Hats since Kaido still wants him back, he will probably help defeat Big Mom and SHIROROROROORO. The reasons for not to join though are: he is a jerk, the straw hats hate him, he is with Big Mom, he could betray them, he does not have a backstory and he doesn’t want to join.
Marco: As an ex member of the White Beard Pirates and a Great Friend to Ace Marco is not only badass but likely to join. After the end of the Paramount War Marco became the leader of the White Beard Pirates and they where targeted by Black Beard. After the timeskip we hear that the WhiteBeard Pirates are dead but Inuarashi and Nekomamushi claim to know where he is. Marco will be a big help during the Wano arc. Reasons for him to join: He was friends with Ace, he fought at the war of the best, he is a LOGIA, he is really strong (admiral level), he faced BlackBeard, he has no crew, he is EPIC, he likes Luffy, he is probably going to be at Wano.
Carrot: Many people really want Carrot to join the crew, she is a cute mink that knows nothing if the world. She is a bunny mink and is helping chopper find Sanji at Whole Cake. She likes carrots and is included at the Pirate-Mink-Ninja Alliance. She is very likely to join and would be a nice add to the crew. Reasons for her to join: She is a mink, she can use the electro and fought zoro, she is cute, she has a dream (to explore the outside world), she calls Chopper Bropper, she has the trait to like carrots a lot,she is a girl (we only have 2 girls out of 9) she is funny, she really likes the straw hats and GARCHUUU.
Law: Trafalgar D. Water Law is an amazing character with possibly the saddest backstory in One Piece. He has been with the Straw Hats ever since Punk Hazard and helped Luffy recover after Marineford. He made an aliance with the Straw Hats and helped Luffy defeat Doflamingo. Luffy has also mentioned Law to others as part of his crew, Law then screamed “No I am not!” Reasons for him to join: He hates bread, has the best devil fruit, Luffy thinks of him as his Nakama, he has a backstory, he likes the straw hats a lot, he is a fun and epic character, the fans love him, he is strong and has helped the crew a lot.
Reasons for him not to join: He has his own crew, he is already in the alliance.
Bartolomeo: Lulululu….luffy-senpai!!!!!I love him, and he loves the straw hats xD Bart is funny and the Straw Hat’s number one fan, he isn’t very strong but could help, just like he did at Dressrosa. He joined Luffy’s grand fleet.Reasons for him to join: He loves the Straw Hats, he is funny, he is willing to help. Reasons for him not to join: He has a crew, he is at the Grand Fleet, he does not have a backstory or a dream.
Reiju Vinsmoke: Sanji’s big sis she saved Luffy’s life and they met at Whole Cake Island, she has awesome weapons and a possible great devil fruit power. Reiju also helped Sanji when he was little and she unlike her other brother has emotions. Reasons for her to join: She is strong, she is awesome, she is kind, she helped Luffy, she is Sanji’s sister, she is trying to sacrifice herself and she has a tragic backstort.
Reasons for her not to join: She could die this arc, she can’t disobey her father, she has no dream(that we know of).
There might be some possible new Nakamas in the future, but for now those are all I see. THANKS EVERYONE!!!!
*Theory by kingKongJulia