Tentacle (Runescape)

Tentacle is a mermaid from the game Runescape. She appears in the quest Deadliest Catch.

Biography
Tentacle resides on a small island in the Northern Sea, alongside her sisters, Urchin and Anemone. The mermaids control a sea monster called the Thalassus. They claim to use it as protection against humans but they enjoy feeding people to the creature.