13 (jjusan13), firefly (honkai: star rail), firefly (spring missive) (honkai: star rail), honkai: star rail, honkai (series), monitoring (vocaloid), vocaloid, absurdres, highres, 1girl, black hairband, blush, bow, eyepatch, gradient hair, green bow, green hair, grey hair, hair between eyes, hair ornament, hairband, long hair, medical eyepatch, multicolored hair, official alternate costume, open clothes, open mouth, plaid bow, red eyes, school uniform, serafuku, smile, solo