Mermaid Thetis is a character from Saint Seiya, serving as one of Poseidon’s Mariner Generals. She is the guardian of the North Atlantic Pillar and a loyal subordinate in Poseidon’s army. Calm, elegant, and highly devoted, she acts as a messenger and combatant, often carrying out orders from the Sea Emperor. Thetis stands out as a capable warrior who supports the story’s underwater conflict and helps establish the hierarchy and threat of the Mariner forces.