I think it would be helpful to selct a few polys fom the figure X's body and call them" base for character X", and make it a prop and dont bother to materialize it, move your prop  (he he he) into position onto this base with your character X zeroed in the scene........... export an .obj, and select your prop  and the "base" to be the parts of the .obj. ......name it "prop that fits character X". .......then you can bring it back in and save it in your library. When you load this prop, it will always fit character X snug as a bug.

repeat process for character's Y and Z, changing prop names as appropriate

Doc did I do good?

P.S.   I might be totally wrong about what your goal is here....how about a hint ...can this  prop be enjoyed by one,  two, or more figures  at   one time?????

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