Salva is a real person (the story is based on him) while Nya is a fictional character.
Exemplar basically means a typical example, or model, of a concept or role. However the meaning can be extended to mean he best example of a concept or role. For instance, someone might say that you are an exemplar student, which can mean that you are a great example, or model, of a student.
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Caesar says the famous line "Et tu, Brute?"
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