Landfish

Landfish (Japanese Name) is a monster seen in the Spin-Off Manga 'The Ways of a Monster Nation'. They reside in Tempest inside a dome which Rimuru made to mimic a forest.

Appearance
A fish which has 2 arms either side just above a small fin on either side aswell as also having 2 legs which it uses to walk.

Trivia

 * Although no real name was given, the nickname 'Landfish' was made due to it being a fish which has legs.