Initially Nymani looks to be a mixed ethnicity human woman, with more Varisian than anything, but a little Kellid as well. Her hair is a temperamental red, and left long and generally free.
When dressed for battle she wears a suit of scale armor crafted to imitate the hide of a dragon, and carries a long handled spear. The weapon's haft has been etched and stained with markings that tell the tale of the Pathwarden who carried it before her.
When not expecting trouble she wares lose fitting and practical clothing, with little flourishes of collor here and there, often in the form of silk scarves and picked wild flowers. Even in peaceful situations she carries at least a dagger, and a "walking stave" as well, if possible.
Her travels have done little to darken her complexion, though she bares a number of scars, each with its own story told over a mug of ale. If she's dressed down enough her scars are showing, it's easy to spot her scales. Beginning somewhere in her hair, and extending down her shoulders and back, are fine draconic scales, black as midnight.