koukiki9, bokuto koutarou, haikyuu!!, commentary, english commentary, highres, 1boy, adam's apple, character signature, facial hair, fangs, fingernails, goatee, grey hair, holding, holding pen, looking at viewer, male focus, mouth hold, msby black jackals volleyball uniform, multicolored hair, open mouth, pen, short hair, simple background, solo, sportswear, teeth, teeth hold, tongue, two-tone hair, upper body, volleyball uniform, white background, white hair, yellow eyes