Noire

Noire is the daughter of Tharja. In the future, whenever Tharja developed a new curse, Noire was usually the unlucky test subject along with her father sometimes. She would dread these sessions with her mother and inversely loved whenever her father would stop Tharja's experiments to take her home. Noire became timid and meek as a result of many years of testing. To counteract this, Tharja developed a special talisman which created a much more brash and somewhat violent persona for Noire whenever she wore it. With the threat of Risen becoming too much, her parents committed to fighting off Risen and both died protecting Noire. Noire was given Tharja's wedding ring, which she wore from then on. Noire joined Lucina and the other children during their journey into the past to prevent the ruinous future.

(Source: Fire Emblem Wiki)