How would Tokusatu be handled in TTL? I imagine the first Godzilla being an anti-nuclear allegory and the same as OTL.
Kamen Rider could have Shocker be some Nazi organization that hid underground(maybe in Cuba?) and are maybe manipulating events to destroy the USAR. Their leader may be more of a Japanese fascist(in the original Kamen Rider the leader is a Nazi) that escaped and is setting up a base with the help of McArthuist Cuba, as well as Fascists and Nazis from Brazil, Germany, Italy that escaped punishment and fled to join him. And Kamen Rider is maybe a vigilante or "Communist Superhero" whom maybe was a dissenter to the Japanese Fascists or Chiang in China.
Not sure about Super Sentai/Power Rangers through, or Ultraman. I feel that the Ranger teams might be more international in scope and coming from all walks of life, but they stand a good chance of not existing TTL(especialyl Ultraman) or something different completly.
I actually had an idea of how Ultraman would be handled ITTL.
My idea was that there'd be an overarching story: the main villains would be an evil capitalist alien empire, with an army of giant monsters, who want to conquer and enslave the human race. Probably named something like "The Furerian Empire".
Ultraman, a socialist dissident from the Land of Light in Galaxy M78 conquered by the Empire, escapes from prison to warn the Earth, chasing an Empire recon droid. Arriving at Tokyo, he fights the droid, accidentally killing scientist and United Earth Patrol researcher Shin Hayata. Feeling guilty over his death, he merges his soul with his body, bringing him back to life and allowing Ultraman to have a human host. With the help of the United Earth Patrol, Ultraman becomes humanity's defender.
Since Ultraman was heavily influenced by Thunderbirds and Doctor Who IOTL, I'd imagine that it'd be more influenced by American sci-fi like Star Trek ITTL. Like, maybe they'll eventually go into space to liberate the rest of the galaxy from the Furerians.
Actually, it's funny, because a lot of early toku villains definitely had a Nazi/fascist vibe going on. (Black Cross Fuhrer, anyone?)