Final answer:
The primary flaw in Narcissus's character is his excessive vanity and self-obsession, which is reflected in the term 'Narcissistic' derived from his name.
Step-by-step explanation:
The main character flaw in Narcissus's character is his vanity. Narcissus is a figure from Greek mythology who was so proud and in love with his own beauty that he eventually died staring at his own reflection. While his behavior could be framed as self-love, the term 'Narcissistic,' derived from his name, has come to mean excessive self-obsession and vanity. This contrasts with altruism, a form of prosocial behavior marked by selfless helping of others, and neither honesty nor courage are accurate representations of his central flaw.
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