1girl, arknights, bikini, black_bikini, demon_girl, demon_horns, detached_sleeves, from_behind, full_body, hair_between_eyes, hair_ornament, hair_rings, horns, lch, long_hair, long_sleeves, looking_at_viewer, looking_back, official_alternate_costume, purple_eyes, red_hair, sandals, single_hair_ring, solo, star_(symbol), star_hair_ornament, surtr_(arknights), surtr_(colorful_wonderland)_(arknights), swimsuit, white_sleeves