Merman

Mermen (マーマン) are an aquatic demi-human race that inhabit the oceans of the New World.

Background
Mermen were a race that inhabited the seas located around the Roble Holy Kingdom. They had a long history of mutual cooperation with that nation. However, the memories of war with demi-humans still remain strong with the humans and elevates the sentiment that they could never truly accept them as allies.

Trivia

 * In the Web Novel, the Mermen are also found in the Argland Council State.
 * One Merman, named Ran Tsu An Rin is a member of Nine Colors.