1girl, animal_ears, ao_oni_(onioni-aoi), arknights, bare_shoulders, bikini, blush, braid, breasts, brown_eyes, brown_hair, choker, closed_mouth, from_below, gradient_background, hair_ribbon, jacket, long_sleeves, looking_at_viewer, looking_down, nose_blush, official_alternate_costume, open_clothes, open_jacket, ribbon, roberta_(arknights), roberta_(summer_flowers)_(arknights), short_hair, side_braid, small_breasts, solo, swimsuit, upper_body, white_bikini, white_choker, white_jacket, white_ribbon