Nimuviel's face is framed by long black locks of hair, her eyes are of a light slate colour. She stands but as tall as the average elf and is lithe of posture, though her back and shoulders are strong. Although she will appear shy towards strangers and slightly uncomfortable around large groups of people, she is quick to overcome her reservations with those who appear friendly towards her and will treat those who have won her trust with consideration and generosity.

Nimuviel prefers to wear practical close-fitting clothing when travelling, loose and comfortable garments when around her home. She wears no jewellery save two pieces, and even these never on the road: a beryl necklace, and a silver brooch in the shape of a swan, which she wears inside her vest, close to her heart.