Why were the Nuremberg trials after WWII for the Germans only? The same charges used against the the Germans could be easily extended to the Japanese or possibly Italians. They have committed as much war atrocities as the others against the Chinese and POW. Why was not the Japanese Emperor and his generals charged as most of the German counterparts?
Look up the Tokyo trials. As for the Italians, they weren't implicated in war crimes on the same scale as the Germans and Japanese.
The 'big' trial as mentioned above was carried out in Tokyo. But there were numerous other trials of Japanese personnel with various degrees of fairness. My answer is a summary based upon sources that I am familiar with.
- The US
Roger Mansell has a collection of the American lead trials under Pacific Area War Crimes Trials, Guam that were mostly held in Guam.
Australia and England held trials all over the South Pacific from New Guinea to India. The Singapore trials covered a wide range of crimes, especially the Death railway. Singapore war crimes trial is a pretty informative site that can take you to some better primary documentation.
But despite the desire for justice, most of the Japanese convicted were rehabilitated as Japan became an important buffer in the cold war.
- China (ROC and CCP)
The situation was highly complicated as the Japanese surrendered both to the communists and the KMT. The two acted very differently, Kushner's Men to Devils is great on this.
Many of the Japanese captured were in Manchuria and held by the Soviets essentially without trial. I don't have a great set of sources for this, here's a NY Times article. I am least familiar with this and could use suggestions.