Okay I was asked to do this, so here you have it.

    One piece:

    Nami

    Robin (Definitely)

    Hancock (Definitely)

    Shirohoshi (Maybe. I want to but I don''t know how to go about it)

    Rebecca (Possibly, but unlikely)

    Viola (With Rebecca)

    Reiju (Maybe, but right now I can only think of repeating the set up used with Nami, so I''m open to suggestions.)