Arsinoe is a lithe air genasi woman with cool bronze skin dusted by faint, cloudlike patterns along her shoulders and temples. Her white hair lifts and stirs even in still rooms, as though caught in a private breeze. Her eyes are pale gray-blue, and her voice is soft, airy, and slightly breathless, becoming a rapid whisper when she is frightened or excited. Years of outdoor travel have weathered her cheeks and roughened her hands. She dresses in layered gray and saffron cloth, with a blue scarf that constantly flutters around her neck.

Arsinoe is observant, restless, and easily distracted by unusual weather, unfamiliar plants, or secrets that seem to be hiding in plain sight. She is kind in practical ways, offering medicine, directions, or a warm meal, but she dislikes sentimental displays. She enjoys strangers because they are temporary, and temporary relationships feel safer than promises.

Arsinoe was born during a storm that tore the roofs from half a coastal settlement. Her mother, a mortal herbalist, claimed the newborn never cried. Instead, the room filled with a low humming wind, and every candle flame bent toward the cradle. Arsinoe grew up learning that her elemental nature made people curious, cautious, or superstitious. She answered most questions by leaving before they could become accusations. As a young woman, Arsinoe withdrew to a ruined watchtower in the hills, where she cultivated medicinal plants and studied the voices carried by the wind. Her solitude ended when she experienced a vision of a great invisible current moving beneath the world, carrying secrets, spirits, and forgotten names. The vision awakened her innate sorcery. Since then, she has traveled in search of the source of that current, carrying a collection of weather-stained notes and herbs from every place where the wind behaved strangely. She is willing to help people, but she refuses to be owned by any temple, lord, or prophecy.