A wood-elf clad in grey, dusty robes. She looks as ageless as any elf, and maybe a bit withdrawn, but not haughty. Rather like she's really elsewhere with her thoughts, listening to the wind and water and trees at the same time as talking to you. When speaking Elvish, a native speaker might detect a fairly ancient Greenwood dialect. However, in Common her language follows the modern standard.  
 

Nimlith has long straight blonde hair shot through with single copper strands. Her face is fair, but not extraordinarily so - you can tell she is not a young elf any more, but other than that it is as ageless as any other elf. Her eyes are dark grey.
She speaks with a Nandor accent in Sindarin, but with modern Westron. She is also an adept singer, though does not have a trained voice and will likely give the stage to a minstrel if one is available. Her singing voice is somewhat husky.
Usually she is clad in ragged, dusty and grey robes when travelling, as she prefers practicality to looks. When she is at a formal event, she will don a Tawarwaith robe from her home. She never wears shoes and prefers walking on the soft grass to walking on stone roads.