Comments

But..... if darker skin is caused by years of evolution making more melatonin for the skin to protect itself from geographical areas that have more direct sunlight, how could it make the skin of a mermaid (assuming it's skin on the human part is just like a humans) who's more than 20 metres under water where little to no sunlight penetrates, then it must be a fantasy story and no one should really care as long as she does a good job.