Yasuhiro Imagawa's "Giant Robo: The Day the Earth Stood Still"

Giant Robo assists
the warriors of Mount Liang

This retro-futuristic anime, inspired by Mitsuteru Yokoyama's manga of the same title, is set largely in a 2039 China that is simultaneously medieval, modern, and futuristic, where dirigibles, skyscrapers and trains co-exist with Taoist sorcerers and warriors on horseback.

A Japanese child Daisaku Kusama, recruited into the International Police Organization for his unique ability to command a powerful robot, goes to China to support the Beijing/Peking branch of the IPO. There he meets a colorful team of colleagues, many of them based on well-known characters from the Chinese classical novels Romance of the Three Kingdoms and Water Margin (aka Outlaws of the Marsh).