@Zkaiser:
I personally want Luffy to obtain a marine via Stockholm syndrome.
The marine would somehow get captured in some mishap by the Strawhats and slowly come to the realization that maybe his/her version of justice can be carried out easier without the restraint of the World Government and that maybe his/her calling to the sea was actually a call to piracy instead of service.
Lol I like this idea! Hope you can expound on it more! I'm really interested with this idea of your character!
I personally want to see a former marine turned pirate as one of straw hats crew as well! Though as one brought up, there's this captain who is known as a former marine, but he's not in in luffy's crew, so i doubt we'd see more of him. Would add more color to luffy's crew collection of eccentric people: "pirate hunter, pirate thief" and now a ex-marine. Haha.
I also think Luffy's wish of 10-person crew would be fulfilled before going to the New World. (Well, I hope so)
Now, I'm hoping for a new nakama in a new and yet to be introduced character so far, as the past characters certainly do not give me any feeling that they'll be joining luffy.
And as someone mentioned earlier, I also would be happier if luffy recruits a new member with the straw hats reunited. Though I have an exception to this scenario, if the new member gets invited even before luffy reunites with the others, that member has got to contribute significantly to luffy's reunion with others.
As for the heck of speculation, I'll go in-depth with the character I personally want to see, though I highly doubt this character's existence's possibility.
As I've said earlier, I want someone allied with the marines to join Luffy's crew, though technically not a marine soldier, but perhaps a marine scientist would do the trick? I'm just elaborating with my idea, since I don't have much to add to the hancock/jimbei discussion. xD lol.
Then as for the quirks, I would like to see a tomboy just to see Sanji's reaction. Also, this girl would terribly obsessed with cleanliness, giving her the role of Strawhat's maid for laughs. Though I'm not sure what her personality would be since the dominating female already belongs to Nami (the punch everyone that gets on her nerves member) and Robin is the fairly eccentric always obedient to her captain. She'll prolly be in the middle, though I hope for this new female character be part of the funny group of Strawhats (aka Luffy,Chopper, Ussop and Brook party)
As for the pattern with girl characters that join Luffy, being a scientist fits into the pattern of "genius" girls. As I've rewatched the episodes, Nami and Robin have both been praised as genius. Though chopper was as well I think…
Of course she'll have a sad past as with the other crew, but I dont have any ideas for that now.
She won't be a strong fighter but rather more of an important support character that will help bring out the potential of the other members of the crew. A scientist specializing on training and bringing out a human's potential especially those of devil-fruit users sound really appealing to me. And what more, she's the prized student of Dr. Vegapunk! And while Dr. Vegapunk specializes in creating human-weapons, she excels in planning out marine trainings and discovering new abilities or ways to use a devil fruit ability.
Why scientist? Well, I dunno if it's just me, but so far, one of the reasons for Marine's strength is the advanced weapons and discoveries by their scientists. Haha. In short, I want something similar be added to Strawhats~ lol, lame I know! haha.
Yeah, I'm getting a bit overboard. LOL.
I hope to hear more of personal-want-to-see nakamas~
PS: I wish Dr. Vegapunk's character would be introduced formally soon~ xD!!