For Holocaust revisionism, there’s Ikuo Suzuki who wrote a book on Anne Frank last year. Here is how described himself in a comment on Occidental Observer.
I have been studying the Holocaust controversy since around 2000. I am the only (unfortunately) Holocaust revisionist in Japan who is fully active now that my mentor, Professor Ichiro Kato, has passed away.
viewtopic.php?f=2&t=14675https://www.theoccidentalobserver.net/2 ... uo-suzuki/In the 90s, a Japanese magazine published a revisionist article.
https://codoh.com/library/document/no-g ... gazine/en/Another fairly recent incident.
viewtopic.php?f=2&t=14107Overall, Japan has not been a major player in Holocaust revisionism, although keep in mind that they are still under Western occupation.
I’m not familiar with Japanese scholarship on Pearl Harbor or Hiroshima and Nagasaki but I’m sure many Japanese people at least privately hold revisionist views on this.