Nina from Fire Emblem Fates.
Trigger: NinaFE1, grey hair, twintails, twin braids, blue eyes, ahoge, long hair, bangs, parted bangs
Default: NinaDEF, headband, hooded capelet, leather, chest harness, belt, key, striped pantyhose, leather boots
Resplendent: NinaRES, head weath, official alternate costume, sleeveless, wings, pantyhose, bracelet, flower, boots
Thief: NinaTHF, hood, cape, mask, bodysuit, chest harness, leather belt, key, thigh boots
I recommend using white background on negative prompt. I don't know why, some of the backgrounds it gave me were cut with white spaces, but I don't know how consistent this is, just a recommendation to be cautious.