Deep Storm Character

The character needs a mystical name! What comes first to your mind?

An illustration for the Deep Storm, the game I'm developing. It takes place on a planet where the great sea is the only inhabitable place. In the character's design, you can see elements from sea creatures and sea plants. Hair is jellyfish-like tentacles, Gills on ribs, and Clothes made out of sea plants. It has a long fishtail that doesn't show in the pictures. Personality is mystical, giving out ghost-like vibes. It is friendly, but you can never be sure of its true intentions. This species uses biomechanics to help them survive, for example, the echo sounders on their ears. They are one of the most intelligent creatures in the sea, but not the only ones.