You are missing something basic here. The hair props will work with any character with a head. They may not fit very well, to be sure, but they will work. If you are using a hair prop from the "Hair" Library and it has been placed on a figure and parented to that figure's head, then you have taken the prop out on the branch of a tree and done special adaptations to it. To use this prop on an entirely different figure, you must back track to the simple prop and go out a different branch to adapt it to the new figure. This has not been obvious before Vicki, because P3-P4-Casual-NYW-Eve are all the same head, so it has not been necessary. You would have to do this if you wished to fit the hair to the P3/P4 male or to Mike. The rescaling is a minor thing. If you are looking for simple "fire and forget" type steps, you will seriously restrict the possibilities in Poser open to you.