1girl, arknights, black_choker, black_shirt, choker, crop_top, grey_background, horns, long_hair, looking_at_viewer, midriff, navel, official_alternate_costume, ponytail, purple_eyes, red_hair, shirt, solo, stomach, surtr_(arknights), surtr_(liberte_echec)_(arknights), very_long_hair, xinxin