Don't know what Lucas stole from Japan for Star Wars, but he lifted quite a bit from comic artist Jack Kirby.
Kirby created the character Dr. Doom, who was horribly scarred, and hid his face behind a mask. Darth Vader was a mash up of Doom and a character named Darkseid from the New Gods. In the New Gods, there were two kingdoms at war with each other, Apocalypse and New Genesis. The hero of New Genesis was a character named Orion, who, it was later revealed was Darkseid's son. They even had a power called the Source, which I'm pretty sure "The Force" was lifted from.
Starwars was inspired by Kurosawa’s film The Hidden Fortress, about a Samurai and two bumbling soldiers who rescue a princess from the bad guys.
Starwars was inspired by Kurosawa’s film The Hidden Fortress, about a Samurai and two bumbling soldiers who rescue a princess from the bad guys.