She is a high-necromancer who is the mentor of the protagonist of Eden's Ritter Grenze. Since the English spelling of her name is unknown, I have tagged her with the in-game nickname "Poyo".

default outfit:

1girl, poyo, large breasts, red eyes, purple hair, very long hair, bangs, twin braids, braid, hair bow, hair ornament, black cape, cloak, floor-length hem, center opening, breasts, cleavage, navel, black thighhighs, thighhighs, black boots, thigh boots

default outfit with hood:

1girl, poyo, large breasts, red eyes, purple hair, very long hair, bangs, twin braids, braid, black cape, hood, hood up, hooded cloak, floor-length hem, center opening, breasts, cleavage, navel, black thighhighs, thighhighs, black boots, thigh boots

p.s.

Her in-game attire was naturally awaiting review, so it will be a while before it appears. Or it will not be displayed permanently.