the charmed individual will not do anything that is contrary to his alignment or character.
Im not sure how much Charm spells effect game play but Ive suffered at their hands a fair bit through my gaming career and been forced to do things that have not only made my character look like an idiot but violate his personal ethics. It is good to see that isn't the case in Rifts.
I know it is a little advantage, but the Principle's prudish personality can actually go a long way to protecting his integrity while under the effects of charm!
I'd love to know if there are other ways that alignment effects magic/spells or their uses if you have ever encountered or thought of any yourself.