1girl, arknights, arm_up, armpits, bare_shoulders, bikini, breasts, criss-cross_halter, hair_between_eyes, hair_rings, halterneck, horns, long_hair, looking_at_viewer, lying, official_alternate_costume, on_back, parted_lips, purple_eyes, rayleigh_scale, red_hair, solo, surtr_(arknights), surtr_(colorful_wonderland)_(arknights), swimsuit, upper_body, white_bikini