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Two important points to be made:
A 'protaganist' is the person who solves the stories central problem. In the real world, there is no convenient 'protaganist' label.

D&D is severely limited from a story telling perspective, because it models combat but not much else. So "optimal" from a D&D rules perspective is not necessarily optimal either from a storytelling perspective or in any other that makes sense to the reader who is not a D&D geek.

Respectfully,

Brian P.