Imo it will be one of them: hiyori,hancock,gyukimaru/onimaru,pudding,pedro,otama,weevil/or someone new
There are many things for hiyori but she must first show her use for the crew (power? Role? Dream/mission? Possibly assisting joyboy 2, which toki wanted to do)
Hancock is another possibility, now that the marines are after her and her island (her role? Dream/mission? Abolishment of the tenryuubitos)
If pudding is in wano, her chance would go up tremendiously (power=memory manipulation, role? maybe something which is connected to her 3rd eye?, dream/mission?)
Gyukimaru/Onimaru was always with shimotsuki ushimaru, if zoro is his son (which highly seems to be the case) he could join (role?, dream/mission?)
If he joins, the strawhats would have a one-sword-user, a three-sword-user and finally a two-sword-user.
Pedro might not be dead, pound didn't die so it highly increases the chances that he didn't die (for me, because as seen, oda does not want to kill of his characters), his power, dream and role(lookout) fit well perfect.
Otama unlikely, as she is too young but if she joins, she would be an apprentice, her power is taming monster and her dream/mission? unclear(besides wanting to adventure)
Weevil is a complete mystery but given his nature (foolish but probably kind) and that only his "mother" is his bond, he will have no one if he understands that he was used.
Furthermore, it was ages ago since he was introduced so at this point his relevance goes down, because we have yonkous and theie commanders as enemies. Sure, he is strong but no way near kaido or bm. He should be around king/queen/jack level, which won't be too high after wano (if zoro/sanji/jimbei defeat them in a 1vs1).
So he could be the last member to join, because after wano, it is highly likely that 2 characters will join at once (or right after one another).
But who knows at this point 🤷♂️
There are many things for hiyori but she must first show her use for the crew (power? Role? Dream/mission? Possibly assisting joyboy 2, which toki wanted to do)
Hancock is another possibility, now that the marines are after her and her island (her role? Dream/mission? Abolishment of the tenryuubitos)
If pudding is in wano, her chance would go up tremendiously (power=memory manipulation, role? maybe something which is connected to her 3rd eye?, dream/mission?)
Gyukimaru/Onimaru was always with shimotsuki ushimaru, if zoro is his son (which highly seems to be the case) he could join (role?, dream/mission?)
If he joins, the strawhats would have a one-sword-user, a three-sword-user and finally a two-sword-user.
Pedro might not be dead, pound didn't die so it highly increases the chances that he didn't die (for me, because as seen, oda does not want to kill of his characters), his power, dream and role(lookout) fit well perfect.
Otama unlikely, as she is too young but if she joins, she would be an apprentice, her power is taming monster and her dream/mission? unclear(besides wanting to adventure)
Weevil is a complete mystery but given his nature (foolish but probably kind) and that only his "mother" is his bond, he will have no one if he understands that he was used.
Furthermore, it was ages ago since he was introduced so at this point his relevance goes down, because we have yonkous and theie commanders as enemies. Sure, he is strong but no way near kaido or bm. He should be around king/queen/jack level, which won't be too high after wano (if zoro/sanji/jimbei defeat them in a 1vs1).
So he could be the last member to join, because after wano, it is highly likely that 2 characters will join at once (or right after one another).
But who knows at this point 🤷♂️