This is a complicated script (I think) and as such I understand if no one wants to do it.
The script would work as follows:
A character would have a set of skills (maybe like shapeshift werebear, shapeshift werewolf, polymorph self Spider, etc.) that they could call from in battle.
Once they use that particular skill, they turn into another actor. As the transition takes place, the actor would retain the same percentage of hp and mp. The actor's would also always be linked together to have the same amount of experience. At the end of every battle the character should revert back to 'human' form.
I'd also need this to be compatible with the tentekai sideview battle script.
My apologies if there is already a script like this. I suppose I could do it with events, but I don't want to cause any unnecessary lag.