Niënor was a lady of Dor-Lómin, the daughter of Lord Húrin Thalion and Lady Morwen Eledhwen. She was also the sister of Túrin Turambar and the late lady Urwen during the First Age.
*MASSIVE SPOILER ALERT!*
Níniel was a lady of Brethil and at the same time, Niënor's unfortunate alter ego. This is part of an ongoing project in which I imagine some concepts for a fictitious film based on The Children of Húrin, the book written by John Ronald Reuel Tolkien but edited and finished by his son Christopher.
Niënor's likeness inspired by actress Lucy Boynton.
Níniel's likeness inspired by actress Anya Taylor-Joy, the idea being that in the film, this would be her own perceived image before she realizes the truth.