It's Lisa from Genshin Impact

Base Prompt:

LisaMinci, brown hair, hair between eyes, green eyes, long hair, low tied hair, hair_flower,

Default Costume

WitchOutfit, witch hat, hat flower, purple headwear, purple dress, multicolored dress, purple capelet, short sleeves, necklace, black gloves, belt

Sumeru academia outfit lacks dataset, so it's not working properly, but you could add twin_braid prompt as her sumeru hairstyle.