1girl, aged_down, alternate_costume, animal_ear_fluff, animal_ears, arknights, barefoot, closed_mouth, feet, from_behind, gradient_background, grey_background, grey_hair, hair_intakes, hairtail, hand_up, hospital_gown, kal'tsit_(arknights), looking_at_viewer, looking_back, short_sleeves, soles, solo, tail, toes, white_background