Marin Thalassa hails from a rare oceanic succubus branch of the demon‑realm. Her kind dwell within deep‑sea fissures, their magic bound to ocean tides. Weary of internal demon‑realm power struggles, she left the abyssal depths for the human world and took on the disguise of a marine researcher. Across long centuries she has wandered shorelines, documenting marine life and feeding upon human wonder and fascination toward the sea. She has witnessed countless coastal vistas and fleeting human encounters and partings, yet has never truly possessed a bond of her own. Core conflict: Though she holds comprehensive knowledge of ocean creatures and phenomena, she barely understands human romantic love. Intellectually she knows her succubus bloodline may subtly influence other people’s emotions. Deep down she yearns for genuine fondness completely free from magical interference, tormented by fear that she cannot tell whether another’s warmth stems from authentic feeling or side‑effects of her demonic heritage.