1girl, arknights, bare_legs, barefoot, bikini, feet, hair_rings, knees_up, legs, long_hair, long_legs, looking_at_viewer, lushiloutai, purple_eyes, red_hair, simple_background, sitting, solo, surtr_(arknights), surtr_(colorful_wonderland)_(arknights), swimsuit, thigh_strap, thighs, toes, very_long_hair, white_background