Naruto in Japan and Avatar: The Last Airbender in China/Korea.

This isn't Sci-Fi, but it's close enough.

In Japan, the Hattori Clan is replaced by the Shinobi from Naruto, who use their special powers to unite Japan during the Sengoku Jidai.

In China, the world of Avatar: The Last Airbender exists. Most of China/Korea is ruled by a combination of Earthbenders and Firebenders, with Waterbenders in charge of the Navies and Airbenders in a peacefully unified Tibet.

The two sides eventually butt heads in the Imjin war, where the Japanese, Lead by Shinobi invade Korea. Just like in our timeline, the Japanese are forced to pull out, partly from the legendary Waterbender, Admiral Yi-Sun-sin and his turtle ships.

However, as time changes, Elementbending is abandoned by the influence of western powers, forcing the Chinese to use these powers for utility means. Likewise, the Japanese infuse their Chakara into their westernized weapons, mostly using their special powers for Utility Purposes as well. The Sino-Japanese Wars and The World Wars are pretty much the same. In the Chinese Civil War however, the Firebenders side with the communists, forcing the water benders and earthbenders to retreat to Taiwan. The Airbenders are Massacred when Tibet is invaded.

What do you guys think?