1girl, arknights, bikini, blue_nails, brown_eyes, brown_hair, hair_between_eyes, holding, jacket, long_sleeves, looking_at_viewer, nail_polish, navel, official_alternate_costume, parted_lips, roberta_(arknights), roberta_(summer_flowers)_(arknights), short_hair, shuiyixiaoya, solo, starfish, stomach, swimsuit, upper_body, white_bikini, white_jacket