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Okay, so from the most recent chapter we see that baby 5 is a female that is quite emotional and well, would be a perfect addition to the strawhats. from this page:

we see that she wouldn't ever refuse a proposal and well... probably won't refuse a request to join the strawhats. She also apparently wants to kill joker.

Well, i don't have much reasoning for wanting her to join other than her emotional personality.. which seems to fit nicely into the strawhats... I just want a strong character to join...