He's a man of neutral quiet. Some could describe it as polite dignity, others could describe it as cold, apathetic distance. It's impossible to tell at a short glance, but what is most often immediately clear about Hiro is that he is a man of tradition. His long life as a disciplined soldier has heavily crafted him into the man he is, and he's hardly ashamed.
Distantly sympathetic at times, generous and always a gentleman...
He does suffer vices, as does anyone.