Doro was a 23rd century Bwujan man.
History
Doro born in 2262 or 2263 to water-breathing Raan XIV and Saya, the rulers of the underwater Bwujan civilization, but Doro was an air-breather who couldn't survive there. Because such mutants were automatically killed by priests, Saya claimed her child had died, then secretly left him along the shore.
He was found and adopted by Tako and his wife, who saw the baby as a sign of hope, and they resolved to raise Doro to become the leader of a surface civilization. By 2266, he was 3 or 4 years old when he met his natural parents and a landing party from the starship USS Enterprise. (TOS comic: "The World Beneath the Waves")