The Greek figure known for his tragic love story involving a forbidden romance with Echo is Narcissus. His tale explores themes of unrequited love and the dangers of vanity. Echo, cursed to only repeat the words of others, fell deeply in love with Narcissus, who ultimately rejected her affections. This tragic relationship leads to Echo's demise and Narcissus's transformation into a flower, highlighting the pain and beauty of love intertwined with self-obsession.