semi serious question here. it actually pertains to the game!
re: protection from chaos (potion)
what would the result be if a chaotic good person were to drink a potion of that sort? wourld there even be an effect?
or would he have an aversiion to himself?
i only ask so as to know if he could even use it to protect himself from chaos creatures.
and now back to our previous scheduled goofieness.
Protection vs Alignment and Magic Circle vs Alignment have no effect on the caster (this include the drinker of a potion or the user of a scroll or item). All they do is:
1) Prevent summoned creatures (of any type or alignment) from physically contacting the subject, or crossing through the circle.
2) Provides additional protection against the attacks from creatures of the warded alignment in the form of +2 deflection to AC and +2 resistance to saves.
3) Suppresses ongoing compulsions for the duration of the spell, regardless of alignment of the caster of the compulsion.
So no, Caerwyn being chaotic in alignment would not hurt him when using protection spells vs chaos.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.