1girl, arknights, ass, bad_pixiv_id, baseball_cap, bikini, bikini_under_clothes, black_bikini, black_footwear, black_jacket, blue_background, blue_hair, breasts, ch'en_(arknights), ch'en_the_holungday_(arknights), cleavage, dragon_girl, dragon_horns, dragon_tail, eyewear_on_headwear, from_side, gradient_background, gun, hat, holding, holding_gun, holding_weapon, hood, hood_down, hooded_jacket, horns, jacket, leg_up, long_hair, long_sleeves, looking_at_viewer, looking_to_the_side, medium_breasts, official_alternate_costume, parted_lips, sandals, solo, strappy_heels, sunglasses, swimsuit, tail, tarutaru_yamaoka, thigh_strap, thighs, v-shaped_eyebrows, water, water_gun, weapon, white_headwear