Reginleif

Reginleif is the seventh eldest of the 13 Valkyrie sisters. Her name means "Heritage of the Gods." She becomes a knuckle-buster for Adam in the second battle.

She is very loyal to her sisters and supports Brunhilde's idea of Ragnarok. Reginleif can also be annoyed with Göll's anxious personality like the rest of her sisters, but she still cared for her along with the rest of her sisters. She was also the one who tutored Göll with her education.

(Source: MAL News, Shuumatsu no Valkyrie: Record of Ragnarok Wiki)