Japan didn't turned from a militarized constitutional monarchy into the one party state that caused the pacific war and comitted all the atrocities we know from a day to another, it was a fast process of twenty years with the military grabbing more and more power, making the political assassinations and sidelining the emperor and the prime minister (even killing one of the PMs) before Fumimaro and then Tojo took over.
Based on that, on a "Hirohito WHO" scenario, could Hirohito have used his authority to prevent the military escalation? Most of the times this question is asked, it ends with the emperor under house arrest or even killed under suspicious circunstances and replaced by one of his brothers or his son, so on this case Hirohito can start acting before his coronation in 1926, what could he have done to prevent that?
Based on that, on a "Hirohito WHO" scenario, could Hirohito have used his authority to prevent the military escalation? Most of the times this question is asked, it ends with the emperor under house arrest or even killed under suspicious circunstances and replaced by one of his brothers or his son, so on this case Hirohito can start acting before his coronation in 1926, what could he have done to prevent that?