He's the greatest Asian fighter of all time. One of THE greats, I have him just outside the top 30 myself.
In terms of skillset, he shows you a lot over the championship distance, but his constant swarming assaults, usually set up by a hugely distracting jab that is, well, I know doubled, tripled, quadrupled but what is it when you throw eight, nine, ten jabs in rapid succession? To lead people onto whatever right hand or burst of punches Harada saw fit.
I'd say the first Kingpetch fight is the perfect place to start. First title fight. Totally unheralded challenger. Totally unfathomable performance.