Are there any ways to remove a charm effect, other than Dispel Magic? Something that allows for the save reroll for example?
Break enchantment
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Protection from evil let a second roll, but when PFE ends the charm will back..
Second, the subject immediately receives another saving throw (if one was allowed to begin with) against any spells or effects that possess or exercise mental control over the creature (including enchantment [charm] effects and enchantment [compulsion] effects, such as charm person, command, and dominate person. This saving throw is made with a +2 morale bonus, using the same DC as the original effect. If successful, such effects are suppressed for the duration of this spell.
Protection from Evil only works against spells that exercise control, and only if the caster is evil (or spell has evil descriptor).
So it works against Charm Person, but only from an evil caster.