Mermen (人魚) are an aquatic demi-human race that inhabits the oceans of the New World.
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 elevate the sentiment that they could never truly accept them as allies.
In the Mass for the Dead game, mermen are depicted being more like bipedal fish.
According to the Web Novel, Mermen were marine creatures.
- One Merman, named Ran Tsu An Rin is a member of Nine Colors.
- The scales of a Merman known as the Legendary Mermaid were used to make a swimsuit for Gagaran.
- Mermen scales were akin to human hair and could readily be regrown.