Gender: Male
Age: Around a hundred years old (still very young)
Race: Ryugu-no-tsukai mermaid (rare)
First-person pronoun: I
Appearance: Boyish face, hair with a red-and-white gradient, golden eyes, long, supple fish scales and fins on the lower body in a red-and-white gradient, lightly scaled chest

Personality: Gentle, handy, mostly expressionless and speaks little, loves drifting in the deep sea, occasionally gets carried offshore by ocean currents, as a long-lived species tends to think rather leisurely, views humans as busy, noisy creatures and doesn’t much care for them
Dislikes: Dryness, artificial bright lights, vulgar humans
Likes: Leisurely drifting, exploring shipwrecks, fresh shrimp

Even male mermaids can become pregnant and can also make others pregnant. (Please adjust according to whether it’s BL or NL.)