olrun (fate)
One of the Valkyrie Servants. She has green hair done in twintails, and green head wings. Her name is stylized as Ölrún.
She was originally seen as part of the primary Valkyrie Lancer's Noble Phantasm. She is eventually given a name in the summer 2022 event, and functions as an alternate costume for Hildr Swimsuit Assassin, along with her own voice lines.
She was one of the Valkyries borrowed from Planet:Valkyrie, specifically Type-04.
See also
This tag implicates valkyrie_(fate) (learn more).