Rhythm (The Fragile Yellow Arc of Fragrance)
From Tardis Wiki, the free Doctor Who reference
Rhythm was an inhabitant of the planet Fragrance. He left behind the Thin Purple Arc and entered the Fragile Yellow Arc when he announced his love for Barbara Wright on the shores of the Emerald Sea and kissed her for the first time.
Barbara's rejection of his love was effectively a death sentence for him, in accordance with the customs of Fragrance. (TV: The Fragile Yellow Arc of Fragrance, AUDIO: The Fragile Yellow Arc of Fragrance)